Acid rock

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For "acid rock" as a geologic term, see Igneous rock.

Acid rock is a form of Psychedelic rock and was the first form of it to achieve popular acclaim. The term acid rock was much used in its heyday, but has fallen into disuse except for putting this music into its historical perspective.

The term refers to a type of music meant to be experienced in conjunction with lysergic acid diethylamide, or LSD, commonly called "acid". Characterized by an off-beat style, vivid imagery, and sometimes strange sound/musical effects, acid rock often settles into a hypnotic groove wherein a listener (and possibly even the band) can "get lost" within a song. For example, the Grateful Dead would perform while on acid, and once they started improvising within a song (or "jamming"), the song could conceivably go on forever. One song, "Dark Star", largely improvised, would sometimes last 5 minutes, but other times it went on for nearly an hour.^{[citation needed]}