Instrumental Duet Instrumental Duet,Piano - Level 4 - Digital Download SKU: A0.741348 Composed by Johann Sebastian Bach. Arranged by Brian Lockard. Baroque,Christian,Easter. Score and parts. 8 pages. Brian Lockard #3513251. Published by Brian Lockard (A0.741348). Piano duet(piano four hands) arranged from the vocal duet in Bach's cantata 140.