Categories Aebersold Play-A-Longs Vol. 3, The II/V7/I Progression: The Most Important Musical Sequence in Jazz (Book & CD Set) Post author By John Coltrane Post date 2012-07-25 [ReviewAZON asin=”156224129X” display=”fullpost”] Tags book, iiv7i, important, jazz, most, musical, progression, sequence, vol.