Instrumental Duet Bassoon,Clarinet,Instrumental Duet - Level 3 - Digital Download SKU: A0.823125 Composed by Clark Cothern. Arranged by Clark Cothern. Contemporary. Score and parts. 8 pages. Clark Cothern #4622875. Published by Clark Cothern (A0.823125). A lively duet, great for practice or as a solo and ensemble piece. Intermediate level.