Tool are an American group of performers of
popular music (though the complexity and intellectual nature of their work belies the term) whose music includes elements of
heavy metal and [art rock]
?. Their music features dark, complex harmonic structures, unconventional time signatures, and the angered voice of singer Maynard Keenan.
Despite the challenging nature of their music, their EP Opiate and their albums Undertow, Aenima and Lateralus have sold millions of copies around the world.
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