Instrumental Duet Clarinet,Flute,Instrumental Duet - Level 4 - Digital Download SKU: A0.980534 Composed by Bob Atwell. 20th Century,Contemporary. Score and parts. 16 pages. Bob Atwell Music #6616297. Published by Bob Atwell Music (A0.980534). A duet for Flute and Clarinet based on Bach's 2 part invention #3 but with additional modern material.