String Quartet Cello,String Quartet,Viola,Violin - Level 5 - Digital Download SKU: A0.489399 By String Quartet. By Timothy Sullivan. 20th Century,Classical,Contest,Festival,Instructional. Score and parts. 3 pages. SullivanWorks #105782. Published by SullivanWorks (A0.489399). In this Multiple Tempi Notation (MTN) Etude, No. 5 from Beethoven's Quartet op. 131 is divided into two duets, Violins 1 and 2 as Duet 1, and Viola and Cello as Duet 2. Duet 1 gradually speeds up while Duet 2 gradually slows down, then both duets reverse this process and meet again in the same tempo in the second last bar.