Sharp 9 Chord Extensions are interesting because a sharp 9 is the same (enharmonic) as flat three. The flatted third is one of the corner stones to blues music. String players often bend the notes between the 3rd and b3rd sounding a tone between the two (flex-tones). The closest keyboard players can come to this is playing the two notes together or using grace notes. Despite this “jazzy” dissonance our unscientific survey found only a few examples. The last example is the “Hendrix Chord” from ‘Purple Haze’.