Instrumental Duet Cello,Instrumental Duet,Violin - Level 2 - Digital Download SKU: A0.515498 By David Guetta Featuring Sia. By David Guetta, Giorgio Tuinfort, Nick Van De Wall, and Sia. Arranged by Michelle Marrocco. Pop. Score and parts. 8 pages. Michelle Marrocco #126251. Published by Michelle Marrocco (A0.515498). Arrangement of Titanium by David Guetta featuring Sia for violin and cello duo.