Bone Kill Duets (Trb 2 only) 15 duets by Michael Davis This is the Trombone 2 duet part only. Must have original Bone Kill etude book in order to play these duets. In the style of Trombone Institute of Technology, Slide & the Family Bone, Family Tree, et al., Bone Kill Duets will transform and energize your performances and practice routine. Composed for 2 trombones, Bone Kill also works extremely well for trombone and trumpet and even 2 trombones and 2 trumpets. The new ‘must have’ duet book for trombonists everywhere!