The blues scale is a hexatonic scale with minor pentatonic scale.[1][2][3] But because blues notes (or blue notes) have a different form, there can be no one blues scale.[4] As named in contemporary jazz theory, its use is based on the key and not the chord,[2] unlike some chords in jazz. The semitone differences for a blues scale are 3-2-1-1-3-2 for instance- C-Eb-F-F#-G-Bb-C