This book offers maximum flexibility, giving saxophonists the choice of playing with two altos, two tenors or alto & tenor. Additionally, after the duet is played once through, there are extra choruses for soloing. This allows the saxophonists to musically communicate with each other by trading choruses or trading phrases during the solo sections of the play-along tracks. There are 3 CDs included with this book; Eb Alto Sax version; Bb Tenor Sax version; Alto & Tenor version.