Never force sound effects or music on visitors. Some visitors like to browse in silence and can be quite shocked when suddenly loud music starts to play or worse the sound of a gun shot explodes from their speakers. Others are not amused when your music choice plays through the music they are currently listening. Most annoying are the so-called MIDI tunes. If you really want to play music or a sound put it on a special page and make it possible to start and very important to stop the music or sound.
Even on sites dedicated to, for example, a music group, a song that starts automatically can be annoying. Often the quality is extremely low, and often a popular song is used, most visitors know already.