Instrumental Duet Instrumental Duet,Marimba,Vibraphone - Level 3 - Digital Download SKU: A0.823135 Composed by Clark Cothern. Contemporary. Score and parts. 8 pages. Clark Cothern #5022815. Published by Clark Cothern (A0.823135). Rhythmic, hauntingly hypnotic and well, clockwork-like. Great for recitals or solo and ensemble festivals. Intermediate level.