If you mean to play music as background try this putting this code into the Head of your html. Of course you will want to replace "SOUND" with the location of your sound file.
<bgsound src="SOUND.wav" loop="-1">
Having your music keep re-playing a certain amount of times or none at all is called the "loop"
In the code above the "loop" is set to replay the music forever. If you want it to only play once then stop, set the loop to 0, or if you want it to replay once, set it to 1 and so on.
Hope that helps.