Tool's "Aenima" was the turning point for the band. Where they stepped out of the style they had been working on with the "Opiate" EP and the commercially successful "Undertow" and created something completely different and unheard of. Whereas the band's sound was slightly more accessible before, on "Aenima" the songs have less definition and are open to multiple interpretations. The songs (if they can even be called that) are monolithic and unpredictable. Even today, I can still find new things each time I listen. From Maynard's cryptic and pessimistic lyrics, to the groove carved out by the amazing rhythm section of Justin Chancellor and Danny Carrey and the massive riffs of Adam Jones, this is truly the album that keeps giving.