Tool's sophisticated art-metal approach (some regard them as prog-metal) is marked by unrelenting aggression and focused intensity. The band's use of serpentine, syncopated rhythms, and tight staccato guitar riffs topped by singer Maynard James Keenan's passionate-but-controlled vocal style separates Tool from the slash-and-burn overkill approach of so many of their heavy rock contemporaries. The band first came to public attention in the waning days of the grunge boom, but have long outlasted that transient era with their dark, brooding vision.













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