Zxlkho is correct. An anticlimactic pick maybe, but I'll buck the trend and at least put a proper explanation.
1. Lateralus
So, my number one Tool song is also my number one song of all time. Somehow, it’s the first Tool song I heard, and I immediately knew that this band was going to change my musical life. The intro riff is deceptively calm, but the storm soon comes in one of Tool’s best riffs. Whether you care for the Fibonacci gimmickry or not, I still think that the phrasing of the vocals in the verses is excellent regardless, and the drums in the verses just sound so… huge, that I can’t help but be blown away. The chorus is just magnificent, but it’s after the first five minutes are done that this song transforms into something that transcends music, for me at least. The reprise of the intro riff with Maynard’s inspirational lyrics and calm singing are what converted me into a complete Maynard fanboy (or Maynerd ha.), and the song builds up impossibly until it all comes to a head at around seven minutes, when the greatest pause ever in music leads into an incredibly simple, but more amazingly effective, riff. The last two minutes of this song are just too majestic for me to describe here, but if you listen in the right circumstances then this song can be a really indescribable experience. My favourite small touch is when the wah kicks in when Maynard sings ‘following our will and wind…’ It shouldn’t change much, as it’s simply the same riff but an octave up and with wah, but it always make me visualise something that I can't really explain, but really adds to the atmosphere of the song. So yeah, I like Lateralus, and I missed out these songs also:
Just-Missed-The-Lists:
Prison Sex
Sober
4 Degrees
Forty Six & 2
Parobol/Parabola
Ticks And Leeches
Jambi
Wings For Marie/10,000 Days
Intension
Thanks to everyone who followed this list!