I used nothing but a text editor to write the frontend, and the backend is entirely yourls: yourls.org. Song lists are stored directly in URLs using iTunes IDs, and yourls shorturls them. A very preliminary version was piggybacking on a third-party shorturling service. I plan to release the source on github in the next couple of weeks.

The top result on a YouTube search for 'song title+band' is played. The Fail button cycles through the next few results.

I agree that the video is a little too small. I've experimented with making that a resizable window on the screen -- I'll try that again.

Copy button! Yes!

Thanks for the feedback!