First, a fundamental piece of an extraordinary sequence of five consecutive masterpieces, an album that significantly contributed to adding new elements to the "Blues-Rock" sounds of the time, which with these four becomes even harder, slower, darker, and heavier. There are also themes on esotericism, of course, but the lyrics also span various "fantasy" territories (like "The Wizard" or "Behind The Wall of Sleep," which is inspired by Lovecraft). The two most representative tracks (the title track and "N.I.B.") would be enough for its masterpiece status, and paradoxically, even without these two songs, the album would remain one of the best "Heavy Blues" (let's call it that, I guess) records of the era. The cherry on top is the excellent work of the band on the two covers of the album, especially "The Warning."
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