Recommended reading for guitarists and all musicians

Improvisation

A Chromatic Approach to Jazz Harmony and Melody David Liebman

How to Improvise Hal Crook

Advanced Modern Rock Guitar Improvisation Jon Finn

Hearin' the changes by Jerry Coker, Bob Knapp, and Larry Vincent

The Advancing Guitarist by Mick Goodrick

Inside Improvisation Series: Vol 1: Melodic Structures by Jerry Bergonzi

Inside Improvisation Series: Vol 2: Pentatonic Scales by Jerry Bergonzi

Inside Improvisation Series: Vol 3: The Jazz Line by Jerry Bergonzi

Inside Improvisation Series: Vol 4: Melodic Rhythms by Jerry Bergonzi

Composition

Jazz Composer's Companion by Gil Goldstein

Beyond Functional Harmony by Wayne J. Nauss

Comping/Arranging

Mel Bays Complete Book of Harmony, Theory and Voicing by Brett Wilmott

Mel Bay's Complete Book of Harmonic Extensions For Guitar by Brett Wilmott

Study of Orchestration by Samuel Adler

Music Business

All You Kneed To Know About the Music Business Donald Passman

Songwriter's Market Writer's Digest Books

Guide To Releasing Independent Records Tim Sweeny

Billboard Guide To Music Publicity Jim Pettigrew Jr (billboard Books)