Trombone Duet Trombone - Level 3 - Digital Download SKU: A0.783080 By Chicago. By Robert Lamm. Arranged by John Groves. Pop,Rock. Score. 24 pages. John Groves #4980813. Published by John Groves (A0.783080). Great fun Trombone Duet edition of Saturday in the Park of this solid hit chart by Robert Lamm originally performed by Chicago.*BONUS EDITION - Besides getting the usual score and parts you have two additional parts included marked Opt. for optional higher edition that facilitate both parts of the duet accordingly and gives you more options for your music making situation. 2nd part can be covered with a non-trigger trombone as low F-trigger trombone notes have optional small cue notes above them for standard non-trigger trombones.Level wise this arrangement works great for high school and up trombonists.Includes full score and individual parts.