If you’re looking for a theory book that relates specifically to the bass guitar, I can recommend any of my books from my store!
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However, I’ve recently made a new book that is tailored for any musician, producer and artist. I’ve really thought hard about the structure and the order of learning that would most benefit the reader. The book covers playing diagrams for piano, guitar and bass, so perfect for any multi instrumentalist! Please do consider giving it a read if you want to experience greater musical freedom.