Music coming from a computer?

Ive been having random sounds on my computer like i hear trailers from movies and music and i cant find were its coming from i dont have any windows open and no music playing any ideas?

• Answer:

  Well, for a mac, check if any applications are running at all by looking at the dock or going to Apple menu(the little apple in the top left corner of the screen)>Force Quit...", and quit all running applications. For a PC, are you absolutely positive that all windows are closed and not just minimized? If there are any open, close them. If the sounds still continue, try restarting your computer. If the sounds still continue, check that it's not from another source, such as another open computer nearby, a radio, a music player, etc. They should be gone by then, but if not, I can't help you any further, sorry.