Tool should not be classified as a rock band. They should be classified as an orchestra. The song writing in this album, I feel is bordering on (and i'm a violinist) the Mozart level. The way that they weave and twist the guitar melodies, drum beats, amazing vocals, and underlying bass rhythm is beyond me. Each song is a masterpiece, a journey. That's not all, the album as a whole, feels like one large, well, opera. Each song is perfectly placed, This cd was designed to be listened all of the way through, no shorter. The listener is taken on a journey as they flow through the truly original songs. And nothing is repetitive. Everything is in sync (no, not 'nsync). All I can say is that if you want to hear what a really true metal band sounds like, a band with amazing talent, a band that has the song writing capabilities with the likes of Led Zepplin, Lennon, and Metallica, all in one, Tool is what you need. If you like this, Aenima is even a more must buy.