By Andrew GreenFebruary 17, 2021Chords, Jazz, Lesson, Theorychords, jazz, lesson, theory This voicing has some similarities to the Bb-13 from COTW 63, the half step between the seventh and 13th, for example. The third has been moved down an octave, and the melody (F) is on top. Bb-7/13 . Please follow and like us: