Plzzzz help me remember the name

Help! I remember reading a yaoi about a composer or musician that was in a slump. He got famous in the underground scene and I think he was producing a boyband. I remember a scene where he went back to the underground scene to get inspiration and there he meet a new kid who was rly good? I also remember him looking down on one of his senpais that were active before he got famous bcz the senpai fell off. The senpai accidentally gave him his delivery service information and the musician made fun of him.