Instrumental Duet Clarinet,Instrumental Duet,Violin - Level 4 - Digital Download SKU: A0.975840 Composed by Beethoven / Derrick Lewis. Contemporary,Instructional,Romantic Period. Score and parts. 23 pages. Derrick Thom. Lewis #1916301. Published by Derrick Thom. Lewis (A0.975840). Variations upon a little known piece (except to Str. Quartet fans) of unparalleled profundity. .