What is math rock?

Math rock is a genre of alternative rock characterized by its complex and unconventional song structures, unusual time signatures, and intricate instrumental interplay. It's less about a specific sound and more about an approach to songwriting and performance. Here are some key characteristics:

Complex Rhythms and Time Signatures: This is arguably the most defining feature. Math rock bands frequently use odd time signatures (like 7/8, 5/4, or even more complex combinations), polyrhythms (playing multiple rhythmic patterns simultaneously), and abrupt changes in tempo and meter within a single song. The rhythms are often irregular and unpredictable, defying typical rock song structures.
Instrumental Focus: While vocals are sometimes present, they're often secondary to the instrumental performance. The emphasis is on the interplay between guitar, bass, and drums, with each instrument contributing complex and interwoven parts. Guitarists often employ techniques like rapid chord changes, arpeggios, and unconventional tunings.
Angular and Dissonant Melodies: The melodies are often less straightforward and more angular, sometimes bordering on dissonance. They don't necessarily follow traditional pop song structures; they might be fragmented, unpredictable, or deliberately unsettling.
Post-Hardcore Influences: Many math rock bands have roots in post-hardcore, sharing an aggressive energy and a DIY aesthetic. However, math rock generally avoids the overtly emotional and aggressive vocals common in post-hardcore.
Minimalist and Experimental Tendencies: Some math rock bands favor a minimalist approach, using sparse arrangements and creating a sense of tension through restraint. Others are more experimental, incorporating elements of jazz, noise rock, and other genres.

Key Bands Associated with Math Rock:

Slint: Often cited as a foundational influence, though they predate the explicit "math rock" label.
Don Caballero: Known for their extreme rhythmic complexity and unusual song structures.
American Football: A more melodic and emotive subgenre of math rock.
The Mars Volta: Known for their progressive and experimental approach.
Battles: A more electronic-leaning band utilizing intricate rhythmic patterns.
TTNG (Titus Andronicus): Though their sound is not purely math rock, it incorporates many similar characteristics.

It's important to note that "math rock" is a loosely defined genre, and bands often blend elements of math rock with other styles. The term itself is somewhat self-deprecating, ironically acknowledging the perceived intellectualism and complexity of the music. Ultimately, the defining characteristic of math rock is the emphasis on intricate and unconventional rhythmic structures as a primary compositional element.