Responses
The Violinist and the Nerd (maybe?)
This one is about a saxophone player but it's got a scene like that I think
https://www.mangago.me/read-manga/koi_dekinai_no_wa_kimi_no_sei/
Yeah it's that one thanks I'm so stupid ╥﹏╥
There was this bl it was black and white, the Mc could play the violin or something close to that and I he was in a band and the ml was a cross dresser and there was a scene where the mc's violin case broke, that's all I remember thanks!