I was thinking of two songs I’ve met through anime that are really special to me, namely, “…To You” by Ayako Kawasumi, the opening from the small anime “Piano: The Melody of a Young Girl’s Heart”; and “Never Looking Back” by Shizukunome, the second ending to You-Gi-Oh!! SEVENS.
So, what are some small pieces you’d like to highlight?
“Kanashimi no mukou he” (悲しみの向こうへ) from School Days. This and the intro are the only redeeming qualities of this anime imo.
Speaking of “only redeeming qualities of the entire anime”, Rosario + Vampire’s Season II op “Discotheque” is also fantastic and is an honorable mention.