SHER Music & Mark Levine 
The Jazz Theory Book [EPUB ebook] 

The most highly-acclaimed jazz theory book ever published! Over 500 pages of comprehensive, but easy to understand text covering every aspect of how jazz is constructed—chord construction, II-V-I progressions, scale theory, chord/scale relationships, the blues, reharmonization, and much more. A required text in universities world-wide, translated into five languages, endorsed by Jamey Aebersold, James Moody, Dave Liebman, etc.