Jethro Tull “Hymn 43”
Though they won a Grammy Award for Best Hard Rock/Metal Performance for the album Crest of a Knave (much to Metallica’s chagrin), the majority of the band’s music lies in the progressive and folk rock territory. However, they have definitely displayed some metal tendencies, particularly on tracks from 1971’s Aqualung – especially this tune, which carries possibly the heaviest riff in their catalogue.
Chicago “25 or 6 to 4”
Sure, they can be labeled jazz fusion. Or their self-described “rock and roll with horns.” And we all know how soft they got with age. But this track rocks, with one of the most memorable riffs of all time.