Instrumental Duet Instrumental Duet,Trombone,Trumpet - Level 3 - Digital Download SKU: A0.695402 Composed by Meredith Willson. Arranged by B. C. Dockery. Contemporary. Score and parts. 2 pages. Ben Dockery #6601939. Published by Ben Dockery (A0.695402). It's Beginning to Look a Lot Like Christmas arranged for trumpet and trombone duet. Great for lessons, recitals, caroling, and Christmas parties.Duration: 1:26.