Hmmm...where I come from, the term "acid rock" referred to psychedelic bands that veered toward heavier, louder material. Certainly not Floyd or APP, who were fairly easy going sound-wise, but more like Steppenwolf, Iron Butterfly, Vanilla Fudge and Blue Cheer in the 60s and early Alice Cooper and Black Sabbath in the 70s. But I suppose rock terms are much like Newton's Third Law, where every definition has an equal and opposite definition.
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