Once a pioneer of San Francisco psychedelia, Jorma Kaukonen is a bona fide graybeard folk swami at age 74. His latest LP is all austere, unplugged displays of the Piedmont finger style that's been his signature since his 1966 Jefferson Airplane showpiece "Embryonic Journey." There are covers and originals: "The Terrible Operation" is a randy 1930s blues number that recalls Hot Tuna's "Keep on Truckin' "; longtime wingman Jack Casady adds bass on "Bar Room Crystal Ball," a gentle jammer spangled with Larry Campbell's iridescent pedal steel. And Jorma? He mostly lays back, a master in situ, unfurling melodies and savoring every note.