George russell's lydian chromatic concept forms the basis for which approach to jazz improvisation?

George Russell's theory influenced modal jazz. In modal jazz, modes (of a scale) are used rather than the scales themselves to create harmony. Modal jazz became popular after Miles Davis and John Coltrane adopted it for some of their compositions. The most important difference between traditional jazz and modal jazz is that the latter suppresses the normal chord changes and might therefore keep one chord for the duration of eight and even 16 bars.