String Quartet Cello,String Quartet,Viola,Violin - Level 3 - Digital Download SKU: A0.1478380 By Usher Featuring Pitbull. By Armando Perez, Johan Schuster, Max Martin, and Savan Kotecha. Arranged by Alex Shor. Pop,R & B. 14 pages. Alex Shor #1055764. Published by Alex Shor (A0.1478380). For String Quartet.