>>then tool should be considered math rock because they almost never play in 4/4. the song lateralis is in 7/8 - 8/8 - 9/8, to name one example.<<
7/8, 8/8, and 9/8 aren't odd time.... more like uncommon time if anything. The only part on that album that is truly odd time are the high hat rolls that start right after the bass-strumming interlude. Tool aren't a really good example of complex music, IMO. By the way, has anyone heard the emo-indie band Choke while we're on that subject? I heard em about half a year to a year ago, really complicated stuff. Really horrid emo-vocals, too!
edit: I meant the bass strumming interlude in the title track of the album.