What is "math rock"

n. A rhythmically complex, often guitar-based, style of experimental rock music that emerged in the late 1990s.

Math rock is a rhythmically complex, often guitar-based, style of rock music that emerged in the late 1980s, influenced by progressive rock bands like King Crimson and 20th century minimalist composers such as Steve Reich. It is characterized by complex, atypical rhythmic structures (including irregular stopping and starting), counterpoint, odd time signatures, angular melodies, and extended, often dissonant, chords.