I'm not sure how you can expect music to be beyond or even near 1 GB!!! Sounds like a movie at the least! Have you tried you r video player to see if it can play it?
See this:
http://www.gnutellaforums.com/showth...threadid=28801 & oh so doesn't hurt! By the way I've dwnlded a video file A& found out it was an mp3, simply bt changing it's extension to mp3. The same principle might be applied to some mp3 files that are actually video files.