If you're looking for manga similar to Play!, you might like these titles.
This is the tale of a young guitarist who finds himself in the world of competitive music after doing a guest spot with a local pianist a rocking/jazzing out some classical music in a local club. Although the pianist wants nothing to do with him, he soon realizes that this guitarist might be the key to his dream of rock and roll classical music.
Shirahase Arumu is a shy junior high school trumpeter. He isn’t the popular kid, and he has trouble speaking with other people, but when he has that trumpet he feels on top of the world. One day when playing alone in a park after running away from a social function he spots a girl playing the French Horn, whom he can’t keep up with. After entering high school, he discovers that this girl is Seryuu Yuriko, a fairly gifted musician who has attempted repeatedly to give it up because her mind enters a sort of fugue state when she plays, and she doesn’t remember what she does when it happens. She’s big and tough and sexy and angry all at once – can Arumu bring her to just enjoy music?
Every day Sakuta Gotou likes to zone out to his favorite band, "Incest", because it makes him feel at ease. However, this band is very secretive and has yet to have a live performance. Now, when the chance comes to Gotou to see his idol Iive, the band's singer, on stage, he finds out that she is the new transfer student in the classroom next door... and to make this even better she stops the concert and grabs him saying, "I've wanted to see you." What is he going to do now?
Apartment building clerk by day and electronic music composer by night, Kiyosumi enjoys his "clean and simple" existence free from relationships and distractions. One day he gets an unexpected admirer as a distressed female neighbor destroys both his room's window and his solitude...
Sakai and Shoji are two idiots. Their band, Moozmuz, is eccentric, flamboyant and silly. Gogh, their classmate, is a quiet but intense clothes designer. Watch the friendship between these three artists blossom and suffer.