old_contents: import pygame
  import sys
  import time
  from pygame.locals import *
  
  pygame.init()
  DISPLAYSURF = pygame.display.set_mode((400, 300))
  pygame.display.set_caption('Sound')
  
  while True: # main game loop
      soundObj = pygame.mixer.Sound("beep1.ogg")
      soundObj.play()
      time.sleep(1)  # 1초 동안 소리를 재생하도록 둔다.
      soundObj.stop()
      for event in pygame.event.get():
          if event.type == QUIT:
              pygame.quit()
              sys.exit()
      pygame.display.update()
  
new_contents: import pygame
  import sys
  import time
  from pygame.locals import *
  
  pygame.init()
  DISPLAYSURF = pygame.display.set_mode((400, 300))
  pygame.display.set_caption('Sound')
  soundObj = pygame.mixer.Sound("beep1.ogg")
  pygame.mixer.music.load("Shining.mp3")
  pygame.mixer.music.play(-1, 0.0)
  
  while True: # main game loop
      soundObj.play()
      pygame.mixer.music.play(-1, 0.0)
      time.sleep(1)  # 1초 동안 소리를 재생하도록 둔다.
      soundObj.stop()
      time.sleep(10)
      pygame.mixer.music.stop()
      for event in pygame.event.get():
          if event.type == QUIT:
              pygame.quit()
              sys.exit()
      pygame.display.update()
  
subject: revise sound.py to play backgoround music