I stumbled on a couple music reading lists on Amazon. Daniel Levitin suggests 11 books to read on music. Songwriters on Songwriting could be good and I’m especially curious about The Art of Practicing.
And Alex Ross wrote a top twenty guide for 20th-century music, both books and recordings. I’m curious about John Cage’s Silence and Can’t Stop Won’t Stop: A History of the Hip-Hop Generation.