Nobody talks about this one. A small forest band of animals discovers instruments and immediately becomes a chaotic ensemble where the joke isn't that they can't play, it's that they won't stop trying, and their absolute commitment to terrible music becomes genuinely touching. The comedy lands because every character has a reason for being there, a weird little dream that matters to them, and the show respects that even while three raccoons are arguing about rhythm. It's funny in a way that doesn't punch down. By the end you're rooting for these misfits not despite their terrible band, but because of it.
Mori no Ongaku-dan is a 2015 comedy and music ONA from Sunrise.