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The San Francisco Sound refers to the distinctive, improvisation-heavy psychedelic rock that emerged from the San Francisco Bay Area—especially Haight-Ashbury—during the mid-to-late 1960s. It is characterized by long, modal jams; a live-first ethos; prominent use of electric guitars with feedback and distortion; fluid, conversational improvisation among players; and a communal, countercultural sensibility. Bands frequently blended blues, folk, country, R&B, jazz, and raga influences, often incorporating droning textures, extended solos, and striking dynamic arcs. The scene was as much about place and community as sound: Bill Graham’s Fillmore, the Avalon Ballroom, light shows, the Acid Tests, underground FM radio, and Owsley Stanley’s high-fidelity sound systems all helped forge a large-room, enveloping live aesthetic that came to define the movement.

Acid rock is a heavier, louder, and more improvisation-driven branch of psychedelic rock that emerged in the mid-to-late 1960s. It is characterized by extended guitar solos, distorted and feedback-laden textures, modal or drone-based harmony, and a strong emphasis on trance-inducing grooves. The style was closely tied to the counterculture and LSD-fueled happenings of the era, particularly on the U.S. West Coast. Musically, it blends blues-rock’s grit, garage rock’s raw energy, folk-rock’s modal harmonies, and raga-influenced drones, then amplifies everything—volume, duration, and intensity—into hypnotic, often explosive performances.

Psychedelic rock is a style of rock music that seeks to evoke, simulate, and expand altered states of consciousness through sound. It typically features timbral experimentation (fuzz, wah, tape delay, phasing), drones, modal or raga-influenced harmony, extended improvisation, studio-as-instrument production, and surreal, mystical, or mind-expanding lyrics. Emerging from mid-1960s counterculture, it fused garage-band energy with folk, blues, and non-Western musical ideas—especially Indian classical ragas—while embracing new studio technologies and concert light shows. Both a live and a studio art, psychedelic rock ranges from jangly, kaleidoscopic pop to heavy, hypnotic jams and cosmic soundscapes.