I'm not an expert, but it looks like you might need to change this:
create.serverobject("PlayMusic.PlaySong")
MPlay.Play("test.mp3")
to this:
Set MPlay = Server.CreateObject("PlayMusic.PlaySong")
MPlay.Play("test.mp3")
I think that's something along the lines of creating the object, though I have no idea about getting the media to work with it, so I can't help ya there.