John Davies Cale is a Welsh musician, composer, and record producer who was a founding member of the American rock band the Velvet Underground. Over his six-decade career, Cale has worked in various styles across rock, drone, classical, avant-garde and electronic music.

The viola ( vee-OH-lə, Italian: [ˈvjɔːla, viˈɔːla]) is a string instrument that is usually bowed. Slightly larger than a violin, it has a lower and deeper sound. Since the 18th century, it has been the middle or alto voice of the violin family, between the violin (which is tuned a perfect fifth higher) and the cello (which is tuned an octave lower). The strings from low to high are typically tuned to C3, G3, D4, and A4.