Instrumental Duet Instrumental Duet,Organ,Trombone - Digital Download SKU: A0.1019538 Composed by Peter Petrack. Contemporary. Score and parts. 147 pages. Distributed by The Wayfarer Partnership, LLC. #3516475. Published by Distributed by The Wayfarer Partnership, LLC. (A0.1019538). Experience some of the earliest music ever performed in Colonial America, with a Celebration of Moravian Hymns, reimagined for Trombone Quartet and Organ. .