Xenharmonic music

Xenharmonic music is music whose tuning systems do not conform to or closely approximate the common 12-tone equal temperament. The term xenharmonic was coined by Ivor Darreg, from xenia (Greek ξενία), "hospitable," and xenos (Greek ξένος) "foreign." He stated: "This writer has proposed the term xenharmonic for music, melodies, scales, harmonies, instruments, and tuning-systems which do not sound like the 12-tone-equal temperament....Xenharmonics is intended to include just intonation and such temperaments as the 5-,7-, and 11-tone, along with the higher-numbered really-microtonal systems as far as one wishes to go."