Modal jazz is jazz that uses musical modes rather than chord progressions as a harmonic framework. Though earlier precedents exist, modal jazz was crystallized as a distinct theory by composer George Russell in his 1953 book Lydian Chromatic Concept of Tonal Organization. 64, both of which were directly inspired by Russell. An violin jazz scales pdf of modal jazz requires knowledge of musical modes.
In bebop as well as in hard bop, musicians use chords to provide the background for solos. A song starts out with a theme that introduces the chords for the solos. These chords repeat throughout the whole song, while the soloists play new, improvised themes over the repeated chord progression.