EDIT: Your discover page loads every single record on that main page (/discover), generating one HUGE page, (which I can scroll down while it is still being generated), and then once finishes, forces user view back up to the top, as it generates the "0-9,A-Z" menu. There is ~5 seconds delay for me before it finishes loading everything, there should be a better way to do that :)
Also, how about some feedback when a search returns no results? I wasn't able to tell if it was working or just didn't contain any Muse.
Finally, should mention this (appears for now) to be Piano only, and looks to be linking mostly Youtube videos that have been somehow determined to be instructional. (Is there a way for you to detect if a video has embedding disabled? I found a few 'dead' vids because of that.)
Again, neat idea :)
I plan on adding a feedback form to the search page when there are no results, so that users can suggest more music to add. That's at the top of my list for things to do today actually. Right now we've got about 1000 tutorials, but we're planning on adding more soon, of other instruments and more songs. Guitar will be the next instrument added.
As to the pages with dead videos, there should be a link under each video that says "Broken video?", that will pop up a feedback form.