Instrumental Duet Cello,Instrumental Duet,Viola - Level 4 - Digital Download SKU: A0.512137 By Ellie Goulding. Arranged by Alison Gillies. Pop. Score and parts. 5 pages. Quartetpad.com #4615227. Published by quartetpad.com (A0.512137). How Long Will I Love You by Ellie Goulding, arranged for viola and cello by Alison Gillies.