Viola Solo - Level 3 - Digital Download SKU: A0.902851 By Khalid X Disclosure. By Guy Lawrence, James Napier, and Khalid Robinson. Arranged by Matt Luff. Contemporary. Individual part. 1 pages. Matt Luff #6284865. Published by Matt Luff (A0.902851). An exciting arrangement of Khalid's 'Know Your Worth' for Viola! It lines up perfectly with the original track, making for a fun rendition of this hit!Song Credits: By Khalid Robinson, James Napier, Guy Lawrence.