After the success of Tool's 1993 debut album "Undertow", the band was already receiving acclaim for the live stint on the third annual Lollapalooza festival and for their disturbing music videos for the songs "Sober" and "Prison Sex". When it came time to record their sophomore effort "Aenima", bassist Paul D'Amour left the band and was replaced by Englishman Justin Chancellor. When the band recruited David Botrill, the band wanted to broaden their progressive-metal sound to newer heights that most bands wouldn't have done when it came to make a second album. Whereas most groups try to make a second album that was more accessible or stick to the formula that made their first album great, Tool didn't do any of those things. Instead, they went to darker and more melodic territories to set the "Aenima" album further apart from their debut album. What Tool did was make on one of the best hard rock albums of the 1990s that broke more rules on how to rock harder with a much darker sensibility.