Prog Rock is structurally complex, it's technically proficient, it's eclectic, it's fantastical and maybe even philosophical. But is it heavy? Sure Rush and Yes have their moments but more often than not, prog leans too far into its jazz and psychedelic elements to summon any notion of "heavy" by the Sabbathian definition. King Crimson are the exception. The London five piece had the rare ability to have their saxophones and insane time signatures while also maintaining all the power a stack of Marshalls could summon.
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