Kimi no Iro

Both are directed by Naoko Yamada, written by Reiko Yoshida, have scores composed by Kensuke Ushio, and are slice-of-life stories revolving around music and relationships. They both feature similarly beautiful animation as well, although the studios are not the same. Liz and the Blue Bird focuses more on the drama of having to perform one's best with others you may not always get along with, while The Colors Within focuses more on the joy of learning to create music with friends, but they have a very similar feeling and I enjoy both greatly!