Unleashed : the story of Tool

Tool are the Pink Floyd of the 21st Century. Far more than just a metal band, the California - based quartet of master - musicians - Maynard James Keenan, Danny Carey, Justin Chancellor and Adam Jones - have taken the concept of heavy music and completely redefined it.

The intricate complex music which they make shouldn't be successful in today's culture of bland, corporate entertainment, and yet Tool have been the recipients of three Grammy awards and a shelfload of gold and platinum discs.

Their rise to glory has been one of the stranger tales of our time, and Joel McIver's new biography - the first Tool book ever written - delves into the mystery behind the music.

McIver discusses the band members' early lives and pre-fame occupations, the introduction of the bandmembers to each other, their videos, EPs and tours and it features hundreds of interviews.