For people who are enjoying this series and want to know a bit more about the music, I have a playlist on Youtube with performances of all the pieces that are mentioned/performed:
https://youtube.com/playlist?list=PLBlFdDVnLN1uXfIEUsIQHFVfNBVQwBuEf
I update it as new pieces appear. One of the great things about this series is that, unlike a lot of classical music based things, there is a lot of contemporary classical and less-popular works mentioned. There are a couple pieces that I use as placeholders, since some of the ones mentioned in the comic aren't "real." The first piece, "Violoncelles, Vibrez!" is almost certainly the inspiration for "Call of the Cello" based on interviews with Hozumi. I also included a trio by Michael Nyman that is for the same instrumentation of Tetsuo's piece "Sound of the Waves" and is about a Beach... so kind of related? Also, Nyman is one of the composers Tetsuo mentions liking. The Einaudi piece is in the same vein, and I would bet that Yukari and Tetsuo would listen to that composer as well