Hot Tuna

Hot Tuna is an American blues rock band formed in 1969 by former Jefferson Airplane members Jorma Kaukonen (guitar/vocals) and Jack Casady (bass). Although it has always been a fluid aggregation, with musicians coming and going over the years, the band's center has always been Kaukonen and Casady's ongoing collaboration.

Biography summary from English Wikipedia, photograph via Wikimedia Commons.