GIRAFFES? GIRAFFES! - When The Catholic Girls Go Camping, The Nicotine Vampires Rule Supreme [Math Rock]

Fecking Bahamas is a very cool resource for all things math rock related, they have articles on the history of the genre and all the different subgenres

I couldn't write it better than wikipedia: Math rock is a style of alternative and indie rock ... characterized by complex, atypical rhythmic structures (including irregular stopping and starting), counterpoint, odd time signatures, and extended chords.