Multiple YouTube videos on same song

Some tabs like this one use multiple YouTube videos because no single video includes all parts that are analyzed; when any of the videos becomes unavailable, the other tabs should still be able to play with their working YouTube videos instead of forcing piano output.

Love it if we could clean up the videos which don’t play and substitute them for ones that do play.

Problem with auto-cleaning videos is that some videos are different lengths, and thus have different time stamps. Compare a music video and a video of just the music. The music video might have the music not start until some time into the video. If we copied over that timestamp to the music-only video, we end up with the tab looking at a later section of music.