Piano,Trombone - Level 1 - Digital Download SKU: A0.1148421 By Eric Clapton. By Bob Dylan. Arranged by Art.o Artaud. Chamber,Children,Film/TV,Instructional,Standards. Score and part. 2 pages. Art.o Artaud #748594. Published by Art.o Artaud (A0.1148421). Arrangement for EASY level trombone and EASY level piano of Bob Dylan’s Knockin’ on Heaven’s Door, in the key of G major student/teacher duet.