[jjcm]

This is awesome. My only suggestion is to allow the user to switch angles without changing the audio track. Since these are concerts, the audio track is going to be one of the most important things. Often times one video will have significantly better audio than the other ones. It'd be nice to be able to choose that one to stay constant. Alternately, it'd be awesome if there were a way for the bands themselves to upload the recorded concert audio.

I realize that often times getting the recorded audio for a concert can be a finicky matter, but maybe you could partner with one of the many music festivals that are cropping up to make it happen.