Tool is an American rock band from Los Angeles, California. Formed in 1990, the group's line-up includes drummer Danny Carey, guitarist Adam Jones, and vocalist Maynard James Keenan. Justin Chancellor has been the band's bassist since 1995, replacing their original bassist Paul D'Amour. Tool has won three Grammy Awards, performed worldwide tours, and produced albums topping the charts in several countries.

The following year, at a time when alternative rock and grunge was at its height, Tool released their first full-length album, Undertow (1993). It expressed more diverse dynamics than Opiate and included songs the band had chosen not to publish on their previous release, when they had opted for a heavier sound. The band began touring again as planned, with an exception in May 1993. Tool was scheduled to play at the Garden Pavilion in Hollywood but learned at the last minute that the venue belonged to L. Ron Hubbard's Church of Scientology, which was perceived as a clash with "the band's ethics about how a person should not follow a belief system that constricts their development as a human being." Keenan "spent most of the show baa-ing like a sheep at the audience."  Tool later played several concerts during the Lollapalooza festival tour, and were moved from the second stage to the main stage by their manager and the festival co-founder Ted Gardner. At the last concert of Lollapalooza in Tool's hometown Los Angeles, comedian Bill Hicks introduced the band. Hicks had become a friend of the band members and an influence on them after being mentioned in Undertow's liner notes. He jokingly asked the audience of 10,000 people to stand still and help him look for a lost contact lens. The boost in popularity gained from these concerts helped Undertow to be certified gold by the RIAA in September 1993 and to achieve platinum status in 1995, despite being sold with a censored album cover by distributors such as Wal-Mart. The single "Sober" became a hit single by March 1994 and won the band Billboard's "Best Video by a New Artist" award for the accompanying stop motion music video.  With the release of Tool's follow-up single "Prison Sex", the band again became the target of censorship. The song's lyrics and video dealt with child abuse, which sparked controversial reactions; Keenan's lyrics begin with: "It took so long to remember just what happened. I was so young and vestal then, you know it hurt me, but I'm breathing so I guess I'm still alive ... I've got my hands bound and my head down and my eyes closed and my throat wide open." The video was created primarily by guitarist Adam Jones, who saw it as his "surrealistic interpretation" of the subject matter. And while some contemporary journalists praised the video and described the lyrics as "metaphoric", the American branch of MuchMusic asked Keenan to represent the band in a hearing. It deemed the music video too graphic and obscene, and MTV stopped airing it after a few showings.  In September 1995, the band started writing and recording their second studio album. At that time Tool experienced its only lineup change to date, with bassist D'Amour leaving the band amicably to pursue other projects. Justin Chancellor, a member of former tourmates Peach, eventually replaced D'Amour, having been chosen over competitors such as Kyuss's Scott Reeder, Filter's Frank Cavanaugh, Pigmy Love Circus's E. Shepherd Stevenson, Jane's Addiction's Eric Avery and ZAUM's Marco Fox.

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