The recordings contain two mixes of each composition, one mix for listening and one mix to play along with (without drums).Sidemen include John Abercrombie (guitar), Richie Beirach or Bill Dobbins (piano), Jimmy Knepper (trombone), David Liebman (soprano & tenor saxophone), Ron McClure or Rufus Reid (bass), Louis Smith (flügelhorn) and Bobby Watson (alto saxophone).The book contains transcriptions of Billy Hart’s playing with helpful commentary of each recorded performance: A Night In Tunisia - Dizzy Gillespie, Equinox - John Coltrane, Day & Nite - David Liebman, Ralph’s Piano Waltz - John Abercrombie, Embraceable You - George Gershwin, Lo Flame - Bill Dobbins.