This handbook investigates the complex harmonic relationships between scales and chords to provide a systematic framework for jazz improvisation and composition. Author Gary Keller utilizes his expertise in music theory to organize a vast array of harmonic systems, moving beyond basic instruction to offer a comprehensive reference for musicians. The text categorizes scales and their corresponding chord voicings, grounding its analysis in the established conventions of recorded jazz literature.

The subject matter points to a dense, technical resource intended for serious students and professional jazz musicians seeking a structured reference for harmonic theory. Its focus on systematic organization suggests a high level of utility for those looking to deepen their understanding of complex improvisational relationships.