Do all your awesome dance-troupe videos keep getting pulled from YouTube for copyright violation? If so, there's finally an answer. The video-sharing site has just announced the launch of a new audio library, with 150 royalty-free music tracks for use on your videos. You can browse the library direct from your video manager page, and sounds can be sorted by genre, mood, instrument and so on. YouTube's even making a call out to musicians that would be interested in having their work added to the list. Those moves of yours? The world's not ready for them yet.