Amazing
This isn't something you see everyday.
In animation, until close to the ending, the screen was too busy. There was stuff going on all over the place, mainly in having instruments that were a bit off-sync with the song itself going on everywhere, and it was too much to observe it all at the same time. Even though you did a good job of making the subject of the song at the current moment prominent, the rest of the stuff going on around it confused me. Try simplifying the pictures next time. Otherwise, all of the animations were fluid and looked great.
The graphics have a very interesting, homegrown feel to them, as if every frame was hand-drawn and then put together, which is very fitting for the song.
The song was good, although it was a bit cloudy in its remastering, although that's not really your problem. It is a good thing that you acknowledged the copyright though and added a disclaimer.
This is amazing work, and I'm glad to have come across it. Just soften up on the number of drums and guitars.