Instrumental Duet Instrumental Duet,Viola,Violin - Level 4 - Digital Download SKU: A0.1153807 By David Guetta Featuring Usher. By David Guetta, Frederic Riesterer, Giorgio Tuinfort, Rico Love, Taio Cruz, and Usher Raymond. Arranged by Fabio Britto. Hip-Hop,Pop,R & B,Wedding. Score and parts. 10 pages. Fabio Britto #754074. Published by Fabio Britto (A0.1153807). Arrangement of the song Without You (David Guetta feat. Usher) for Violin & Viola Duo. #davidguetta #eletronicmusic #pop #usher.