Cello,Instrumental Duet,Violin - Level 4 - Digital Download SKU: A0.1251096 By Elvis Presley. By Ben Weisman, Bert Kaempfert, Fred Wise, and Kay Twomey. Arranged by Brenton Edgecombe. Folk,Pop. 2 pages. Adelaide String Duo #845206. Published by Adelaide String Duo (A0.1251096). Violin and cello duo (duet) of an Elvis Presley standard, first heard in the film GI Blues. It's based on the traditional German folk song Muss I Denn. This arrangement features both violin and cello on the main theme.