Multiple artists go by this name. 1. Surd is a lo-fi garage low density fantasy punk metal softcore indie band from Bel Air, Maryland. 2. Surd is a techno artist from Brisbane, Australia 3. SURD is a Swedish Free Jazz Quartet, comprised of David Stackenäs's biting guitar, the teeming rhythm work of bassist Filip Auguston and drummer Thomas Strønen, and Fredrik Nordström's gritty saxophone.