It's very important in jazz. Diminished scale is all over. Augmented scale, too (e.g T. Monk's tunes). Tritone substitution is the basis of reharmonization (due

It's very important in jazz. Diminished scale is all over. Augmented scale, too (e.g T. Monk's tunes). Tritone substitution is the basis of reharmonization (due to 12=6*2). Jazz uses everything (including pentatonic), that's why it's so rich.