To control music use object

<object classid="clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95" id="music" style="display:none">
<param name="Filename" value="passion.mid">
<param name="AutoStart" value="1">
<param name="Volume" value="0">
<param name="loop" value="-1">
</object>

style use display none is to hide the control panel

and Filename  value is source file of music mp3/wav almost all file format supported by media player

giving it an id to control the element

therefore to change source is music.Filename="";