Four-string rock instrument isn't usually bass that found its way into blues much later than some other thing, which was fiddle, or violin. You can ask David Cross whose violin heavily contributed to the mid-'70s KING CRIMSON unique sound and established a violin as rock's weapon of choice. A rocker in his heart and a classicist in his approach, David's music is very special and cerebral. But let this alien into you, and it'll become a great symbiont to live with. Try on.