While George Russell has been very active as a free-thinking composer, arranger and bandleader, his biggest effect upon jazz has been that of the quieter role of theorist. His great contribution, apparently the first by a jazz musician to general music theory, was a book with the intimidating title The Lydian Chromatic Concept of Tonal Organization, where he concocted a concept of playing jazz based on scales rather than chord changes. Published in 1953, Russell's theories directly paved the way for the modal revolutions of Miles Davis and John Coltrane -- and Russell even took credit for the theory behind Michael Jackson's huge hit "Wanna Be Startin' Somethin,'" which uses the Lydian scale (no, he didn't ask for royalties).