I was wondering how long it would be before someone posted about these guys.
I’ve heard them characterized as "Math Rock". According to Wikipedia,
Math rock is typified by its rhythmic complexity, seen as mathematical in character by listeners and critics. While most rock music uses a 4/4 meter (however accented or syncopated), math rock makes use of more non-standard, frequently changing time signatures such as 5/4, 7/8, 11/8 or 13/8.
As in traditional rock, the sound is most often dominated by guitars and drums. However, drums play a greater role in math rock in providing driving, complex rhythms. Math rock guitarists make use of tapping techniques and loop pedals to build on these rhythms, as illustrated by songs like those of math rock supergroup Battles.[18][19]
Lyrics are generally not the focus of math rock; the voice is treated as just another instrument in the mix. Often, vocals are not overdubbed, and are positioned less prominently, as in the recording style of Steve Albini.[citation needed] Many of math rock’s best-known groups are entirely instrumental such as Don Caballero or Hella.[20][21]

