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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.