Instrumental Duet Instrumental Duet,Trombone,Trumpet - Digital Download SKU: A0.772197 Composed by Gregory Hamilton. 20th Century,Contemporary. Score and parts. 6 pages. Dr. Gregory Hamilton #5775817. Published by Dr. Gregory Hamilton (A0.772197). Conversation III for Trumpet in Bb and TromboneThis is the third in a series of Conversations for various instrumental combinations.Others include a works for Piano and Strings and other Chamber combinations - available on this site.www.gregoryhamilton.org