One of them is the Disappearance of Nagato Yuki-chan ED. Evan Call’s composition there is magical.
Oh I know one. The ED from Stella no Mahou. Stella no mahou is a fairly mediocre show that you may or may not decide to watch at all, and even if you did, you probably forgot all about it once the season ends. The ED is great though, it’s electronic house(might be wrong) music, rather than a standard anisong. If you’re after some EDM anisong, it won’t disappoint.
Ao-chan Can’t Study. Weirdly really good OP for a short comedy ecchi anime.
I’d like more people to talk about many aspects mushishi since I think it should be considered an all-time classic. Sore Feet Song is one of the few that stuck with me for nearly a decade now.
I don’t believe I’ve seen much discussion of the ED for Tonari no Seki Kun (https://youtu.be/oIKB7i6fcmk), and it is amazing.