B-Flat Clarinet,Instrumental Duet,Trombone - Level 3 - Digital Download SKU: A0.1358096 By Mollie Burns. By Mollie Burns. Arranged by Mollie Burns. Contest,Festival. 4 pages. Mollie Burns #942604. Published by Mollie Burns (A0.1358096). A original piece written for Solo and Ensemble, a unique Clarinet and Trombone Duet.