So What chord
It was employed by Bill Evans in the "'amen' response figure"[1] to the head of the Miles Davis tune "So What".It may also be thought of as a five-note quartal chord (built from fourths) with the top note lowered by a semitone.Other jazz recordings that make extensive use of the chord include McCoy Tyner's "Peresina" and Gary Burton's "Gentle Wind and Falling Tear".Tyner's use of similar voicings was an early influence on Chick Corea; it can be heard in tunes such as "Steps" and "Matrix" (both featured on his landmark album Now He Sings, Now He Sobs).The term "So What chord" is used extensively in Mark Levine's landmark work The Jazz Piano Book, wherein he describes a range of uses for which the voicing might be employed.