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Math rock is a subgenre of indie and experimental rock defined by complex, irregular rhythms, sudden dynamic shifts, and angular, interlocking guitar lines. It frequently employs odd and mixed meters (such as 5/4, 7/8, 11/8), polyrhythms, start–stop figures, and intricate syncopation. Guitars often favor clean or lightly overdriven tones, tapping, and harmonically adventurous voicings over traditional power-chord riffing. Vocals, if present, are usually sparse, textural, or rhythmically coordinated with the ensemble rather than the primary focal point. Aesthetically, math rock draws from the precision and structural ambition of progressive rock, the urgency of post-hardcore, and the textural curiosity of indie and noise rock, resulting in music that feels both cerebral and visceral.

Noise rock is a subgenre of rock that deliberately embraces distortion, feedback, dissonance, and abrasive textures as primary musical materials rather than mere effects. It prioritizes timbre, volume, and sonic density over conventional melody and harmony, often using nonstandard tunings, prepared or detuned guitars, and extended techniques to generate harsh overtones and sheets of sound. Rhythm sections tend to be driving and repetitive, anchoring the chaos with motorik pulses, lurching grooves, or pummeling, minimal patterns. Vocals range from spoken and murmured to shouted and cathartic, with lyrics that skew cryptic, confrontational, or surreal. Aesthetically, noise rock traces a line from punk’s anti-virtuosity and DIY ethos through no wave’s iconoclasm and the avant-garde’s interest in sound-as-sound, yielding music that can be physically intense, psychologically unsettling, and artistically exploratory.

Microtonal music is any music that uses pitch intervals smaller than the 12-tone equal-tempered semitone or uses alternative tunings that divide the octave into a different number of steps. Rather than being bound to 12 equal notes per octave, microtonal composers and performers work with just intonation (pure, whole-number ratios), equal divisions of the octave such as 19-EDO, 24-EDO, 31-EDO, or 53-EDO, and non-octave or non-equal systems. While many non-Western traditions historically employ intervals that do not fit 12‑TET (e.g., Arabic maqām, Turkish makam, Persian dastgāh, Indian raga, and Indonesian gamelan), the term “microtonal” in a modern sense usually refers to the deliberate exploration of these and other tunings in contemporary composition, experimental classical, rock/metal, and electronic music. The focus is on expanding consonance/dissonance palettes, unlocking new chordal colors, and discovering novel melodic gestures that 12‑TET obscures.