Composers/musicians for olders- middle school through high school. All of these are in a wonderfully narrative style written decades ago and probably all OOP but some choices nonetheless.
Deep-Flowing Brook: The Story of Johann Sebastian Bach by Goss
The Music Maker (Bach). By Albus
Trumpeter’s Tale: The Story of Young Louis Armstrong by Eaton
Beethoven by Mirsky
The Story of Beethoven by Kaufmann
Brahms by Mirsky
Antonine Dvorak: Composer from Bohemia by Purdy
Chopin by Gronowicz
The Story of Stephen Foster by Douty
He Heard America Sing (Stephen Foster). By Purdy
The Story of George Gershwin by Ewen
Gilbert & Sullivan by Purdy
Song of the North (Grieg) by Purdy
The Story of Haydn by Kaufmann
Haydn by Mirsky
The Story of Mozart by Kaufmann
Mozart by Komroff
Mozart by Mirsky
Paderewski by Kellogg
Duet (Clara and Robert Schumann) by Kyle
Stormy Victory (Tchaikovsky) by Purdy
HTH