Trombone Duet Trombone - Level 1 - Digital Download SKU: A0.1148422 By Eric Clapton. By Bob Dylan. Arranged by Art.o Artaud. Chamber,Children,Film/TV,Instructional,Standards. Score. 2 pages. Art.o Artaud #748595. Published by Art.o Artaud (A0.1148422). Arrangement for two EASY level trombones of Bob Dylan’s Knockin’ on Heaven’s Door, in the key of G major student/teacher duet.