Stumbled across this trying to find sheet music for "Now We are Free" from Gladiator and found this website....https://www.jellynote.com...and thought it was pretty cool.

Basically it displays sheet music and then gives you accompaniment for the entire track, portions of it, etc. It also appears you can upload your own youtube video directly from it. I haven't looked into the premium membership but the free version looked interesting enough I wanted to pass it along.