<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Washington&nbsp;D.C.&nbsp;20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM 8-K</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CURRENT REPORT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PURSUANT TO SECTION 13 OR 15(D) OF</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>THE SECURITIES EXCHANGE ACT OF 1934</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Date of Report (Date of earliest event reported):<B>
September 18, 2012</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>MusclePharm Corporation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Exact Name of Registrant as Specified in
its Charter)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 33%; font-size: 10pt; font-weight: bold; text-align: center"><B>Nevada</B></TD>
    <TD STYLE="width: 33%; font-size: 10pt; font-weight: bold; text-align: center"><B>000-53166</B></TD>
    <TD STYLE="width: 33%; font-size: 10pt; font-weight: bold; text-align: center"><B>77-0664193</B></TD></TR>
<TR>
    <TD STYLE="vertical-align: bottom">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(State&nbsp;or&nbsp;Other&nbsp;Jurisdiction&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">of&nbsp;incorporation)</P></TD>
    <TD STYLE="vertical-align: top; font-size: 10pt; text-align: center">(Commission&nbsp;File&nbsp;No.)</TD>
    <TD STYLE="vertical-align: bottom">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(I.R.S.&nbsp;Employer&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Identification&nbsp;Number)</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>4721 Ironton Street, Building A</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Denver, Colorado&nbsp;80239</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;(Address of Principal Executive Offices)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(303) 396-6100</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Registrant&rsquo;s telephone number, including
area code)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; padding-right: -0.5in; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD STYLE="width: 95%; padding-right: -0.5in; font-size: 10pt">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; padding-right: -0.5in; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD STYLE="width: 95%; padding-right: -0.5in; font-size: 10pt">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; padding-right: -0.5in; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD STYLE="width: 95%; padding-right: -0.5in; font-size: 10pt">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; padding-right: -0.5in; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD STYLE="width: 95%; padding-right: -0.5in; font-size: 10pt">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<!-- Field: Page; Sequence: 1 -->
    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font-size: 10pt"><TR><TD STYLE="text-align: left; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Item 4.01 Changes in Registrant&rsquo;s
Certifying Accountant.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><I>(a) Dismissal of Independent Registered
Public Accounting Firm</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">On September 18, 2012, the audit
committee of the board of directors of MusclePharm Corporation (the &ldquo;Company&rdquo;) dismissed Berman &amp; Co., P.A.
(&ldquo;Berman&rdquo;), as the Company&rsquo;s independent registered public accounting firm.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="color: black">Berman</FONT>&rsquo;s
report on the financial statements for the fiscal years ended December 31, 2011 and 2010, contained no adverse opinion or disclaimer
of opinion, and were not qualified or modified as to uncertainty, audit scope or accounting principle, except that the report contained
a modification to the effect that there was substantial doubt as to the Company&rsquo;s ability to continue as a going concern.
During the fiscal years ended December 31, 2011 and 2010, and through September 18, 2012, there were no disagreements with <FONT STYLE="color: black">Berman</FONT>
on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure, which disagreements,
if not resolved to the satisfaction of <FONT STYLE="color: black">Berman</FONT>, would have caused it to make reference to the
subject matter of the disagreements in its reports on the financial statements for such year. During the fiscal years ended December
31, 2011 and 2010, there were no reportable events as defined in Item&nbsp;304(a)(1)(v) of Regulation&nbsp;S-K.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The Company has provided a copy of the
above disclosures to <FONT STYLE="color: black">Berman</FONT> and requested<FONT STYLE="color: black"> Berman</FONT> to provide
it with a letter addressed to the U.S. Securities and Exchange Commission stating whether or not <FONT STYLE="color: black">Berman</FONT>
agrees with the above disclosures. A copy of <FONT STYLE="color: black">Berman</FONT>&rsquo;s letter, dated September 18, 2012,
confirming its agreement with the disclosures in this Item 4.01 is attached as Exhibit&nbsp;16.1 to this Form&nbsp;8-K.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><I>(b) New Independent Registered Public
Accounting Firm</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">On September 18, 2012, the audit
committee of the board of directors
of the Company approved the engagement of Ehrhardt Keefe Steiner &amp; Hottman PC, Certified Public Accountants, Denver, Colorado
(&ldquo;Ehrhardt&rdquo;), as the Company&rsquo;s new independent registered public accounting firm.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">During the fiscal year ended December 31,
2011, and the subsequent interim period prior to the engagement of Ehrhardt, the Company has not consulted Ehrhardt regarding (i)&nbsp;the
application of accounting principles to any specified transaction, either completed or proposed, (ii)&nbsp;the type of audit opinion
that might be rendered on the Company&rsquo;s financial statements, or (iii)&nbsp;any matter that was either the subject of a disagreement
(as defined in Item&nbsp;304(a)(1)(v)) or a reportable event (as defined in Item&nbsp;304(a)(1)(v)).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 9.01 Financial Statements and Exhibits.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(d) Exhibits</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 12%; font-size: 10pt; font-weight: bold"><B>Exhibit No.&nbsp;</B></TD>
    <TD STYLE="width: 88%; font-size: 10pt; font-weight: bold"><B>Description</B></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 12%; font-size: 10pt; text-align: center">16.1</TD>
    <TD STYLE="width: 88%; font-size: 10pt">Letter of <FONT STYLE="color: black">Berman &amp; Co., P.A.</FONT>, dated September 18, 2012</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<!-- Field: Page; Sequence: 2 -->
    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font-size: 10pt"><TR><TD STYLE="text-align: left; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SIGNATURES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Pursuant to the requirements of the Securities Exchange Act
of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 38%; font-weight: bold"><B>MUSCLEPHARM CORPORATION</B></TD>
    <TD STYLE="width: 9%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>Date: September 18, 2012</TD>
    <TD>By:</TD>
    <TD STYLE="border-bottom: black 1.5pt solid">&nbsp;<I>/s/ Brad J. Pyatt</I></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;Name: Brad J. Pyatt</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;Title: Chief Executive Officer</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<!-- Field: Page; Sequence: 3; Options: Last -->
    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font-size: 10pt"><TR><TD STYLE="text-align: left; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <!-- Field: /Page -->
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

</BODY>
</HTML>
[{"type": "8-K", "sequence": "1", "filename": "v324027_8k.htm", "description": "8-K", "secsgml_size_bytes": 15505}]
{"company-data": {"conformed-name": "MusclePharm Corp", "cik": "0001415684", "assigned-sic": "2834", "irs-number": "770664193", "state-of-incorporation": "NV", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-53166", "film-number": "121102821"}, "business-address": {"street1": "4721 IRONTON STREET", "city": "DENVER", "state": "CO", "zip": "80239", "phone": "(800) 210-7369"}, "mail-address": {"street1": "4721 IRONTON STREET", "city": "DENVER", "state": "CO", "zip": "80239"}, "former-company": {"former-conformed-name": "Tone in Twenty", "date-changed": "20071018"}}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(D) OF
THE SECURITIES EXCHANGE ACT OF 1934
Date of Report (Date of earliest event reported):
September 18, 2012
MusclePharm Corporation
(Exact Name of Registrant as Specified in
its Charter)
Nevada
000-53166
77-0664193
(State or Other Jurisdiction
of incorporation)
(Commission File No.)
(I.R.S. Employer
Identification Number)
4721 Ironton Street, Building A
Denver, Colorado 80239
(Address of Principal Executive Offices)
(303) 396-6100
(Registrant's telephone number, including
area code)
Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
¨
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
¨
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 4.01 Changes in Registrant's
Certifying Accountant.
(a) Dismissal of Independent Registered
Public Accounting Firm
On September 18, 2012, the audit
committee of the board of directors of MusclePharm Corporation (the "Company") dismissed Berman & Co., P.A.
("Berman"), as the Company's independent registered public accounting firm.
Berman
's
report on the financial statements for the fiscal years ended December 31, 2011 and 2010, contained no adverse opinion or disclaimer
of opinion, and were not qualified or modified as to uncertainty, audit scope or accounting principle, except that the report contained
a modification to the effect that there was substantial doubt as to the Company's ability to continue as a going concern.
During the fiscal years ended December 31, 2011 and 2010, and through September 18, 2012, there were no disagreements with
Berman
on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure, which disagreements,
if not resolved to the satisfaction of
Berman
, would have caused it to make reference to the
subject matter of the disagreements in its reports on the financial statements for such year. During the fiscal years ended December
31, 2011 and 2010, there were no reportable events as defined in Item 304(a)(1)(v) of Regulation S-K.
The Company has provided a copy of the
above disclosures to
Berman
and requested
Berman
to provide
it with a letter addressed to the U.S. Securities and Exchange Commission stating whether or not
Berman
agrees with the above disclosures. A copy of
Berman
's letter, dated September 18, 2012,
confirming its agreement with the disclosures in this Item 4.01 is attached as Exhibit 16.1 to this Form 8-K.
(b) New Independent Registered Public
Accounting Firm
On September 18, 2012, the audit
committee of the board of directors
of the Company approved the engagement of Ehrhardt Keefe Steiner & Hottman PC, Certified Public Accountants, Denver, Colorado
("Ehrhardt"), as the Company's new independent registered public accounting firm.
During the fiscal year ended December 31,
2011, and the subsequent interim period prior to the engagement of Ehrhardt, the Company has not consulted Ehrhardt regarding (i) the
application of accounting principles to any specified transaction, either completed or proposed, (ii) the type of audit opinion
that might be rendered on the Company's financial statements, or (iii) any matter that was either the subject of a disagreement
(as defined in Item 304(a)(1)(v)) or a reportable event (as defined in Item 304(a)(1)(v)).
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits
Exhibit No.
Description
16.1
Letter of
Berman & Co., P.A.
, dated September 18, 2012
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act
of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
MUSCLEPHARM CORPORATION
Date: September 18, 2012
By:
/s/ Brad J. Pyatt
Name: Brad J. Pyatt
Title: Chief Executive Officer