This movie I think will appeal to a lot of fans of Asian dramas, so I think it also falls into the LGBT romance category. Although you say there is more emphasis on the music than the romance. Sounds interesting.
I invite you to join the discord community, the link is in the description. I also invite you to join the moviesonhive trail if you want to support it.
If it's based a lot on music and especially on creating it together, I would love to join the dircord group but I don't know how :(