Microtonal music refers to the use of pitches that exist between the standard notes of the Western musical scale. While traditional Western music typically divides an octave into 12 equal parts (semitones), microtonal music can include additional intervals, allowing for a wider range of expressive possibilities. This approach is often found in various world music traditions, such as Indian classical music and Middle Eastern music, which utilize quarter tones and other divisions. Composers and musicians who explore microtonality often create unique scales and tunings, expanding the harmonic palette available to them. Notable figures in microtonal music include Harry Partch, who developed custom instruments, and Iannis Xenakis, known for his innovative use of microtonal techniques. This genre challenges conventional listening experiences and invites audiences to appreciate the subtleties of pitch.