I forgot the name of a manga I started a few years ago. 🤢

The protagonist is a college student composer and a music teacher/tutor for 3 (side character) girls.
The heroine is from a secret society that "tunes" the world as magical conductors.

"You are weak, from the moment you could only use your life as an excuse for committing crimes, you insulted that very life. You didn't notice, you were afraid of noticing, and you went around destroying everything that could make you notice, but you have also crushed your ability to ever gather respect." -Shokuhou Misaki