Nice job. I'm surprised youtube let you post it with the music. They're always shutting my sound off
You cab replace the entire soundtrack with one from you-tubes collection on/through you-tube./ Notice the song by on the right hand side with a link to buy it? It is you-tubes way to let people use copyright music in their movies, but like I said no other sound track so you can't talk etc. Though they have other sound in this one so meh..who knows. Youtube is odd about their rules. I still have a song in one of my vids that they claim is copyright, even though I have rights to use it, Youtube won't let the video play in Germany, but it can anywhere else...
Personally I like using music from places like
http://www.newgrounds.com/audio/ , or
http://www.ccmixter.org/ and more who post under the creative commons license, which basically means anyone is free to use it for no profit stuff as long as proper credit is given to the author. It is tougher to find what you might consider "good" music as these sites are full of basically no name artists and up and comers.
That being said I'll have to check this vid out over morning coffee.