Iconic architects of San Francisco’s celebrated psychedelic sound, Jorma Kaukonen and Jack Casady, brought their enduring roots-infused mélange, Hot Tuna, to Eugene’s (Ore.) McDonald Theater on Sept. 1st and suitably verified their vaunted rock-and-roll credentials. Though not as widely known as their seminal 60’s group Jefferson Airplane, Hot Tuna have been playing searing, head-spinning shows for nearly five decades.