Tool are practically their own genre, but the act based its debut album, 'Undertow,' heavily on progressive and gritty alt-metal.

Tool had gained many followers with their 'Opiate' EP, but it was 'Undertow' that proved that the religious devotion of Tool's underground fans could be spread to the mainstream. The brilliant tracks 'Prison Sex,' 'Intolerance,' 'Bottom' and 'Sober' can be found within 'Undertow,' along with many other prime cuts which proved to be more addictive than injecting crystal meth into your eyeball.

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