Ooooh. It's so much nicer to se an acrovideo with music than without. So please take the time to put in some music.
Then you have the problem that youtube do not approve just any music due to copyrights. And I guess that's OK. So where to find music?
If you would consider norwegian music, then this is the web for you. This is norwegian artists without a recordcontract yet, but recomended by the radiochannel P3. It's called "urørt" (untouched).
Just remember to put the name of the song and artist in the video.