Bob Dylan may have been branded a Judas-like traitor when he cranked up his amp during an infamous 1966 concert, but the rock ‘n’ roll undercurrents that infiltrated folk music in the ’60s didn’t betray the movement’s grassroots—they amplified the passion at its core. With the war in Vietnam entering its second decade, Buffalo Springfield and other protest singers traded six-string strumming for electrified riffs. The Byrds and Simon & Garfunkel added depth to jingle-jangle harmonies, while counterculture emissaries like The Mamas & The Papas and Jefferson Airplane offered fans new conduits to hippie bliss. This phenomenon wasn’t unique to North America: Across the Atlantic, Donovan and Fairport Convention fused troubadour-oriented tradition with the crackle of space-age technology. As the ’70s wore on, psychedelic grooves overshadowed folk convention and campfire intimacy morphed into radio-friendly soft-rock vibes, but the influence of plugged-in Dylan and his peers continues to this day.