Messiaen's Mode #3 is one of Olivier Messiaen's modes of limited transposition, which are uniquely designed to have symmetrical interval structures that prevent traditional musical development like modulation. Mode #3 consists of nine notes, making it a nonatonic scale, with its intervals distributed as half-whole and whole-half steps. Due to its unique structure, the mode can be transposed only at three different starting notes before it repeats its pattern, thus achieving its limited transposition characteristic. Messiaen used these scales in his compositions to create a mystical and otherworldly sound, often associated with the concept of time in music. Guitarists utilizing this mode will find it particularly effective for crafting enigmatic harmonies and melodies, especially in fusion, jazz, or avant-garde settings. The scale's distinctive step sequence lends itself to creative improvisations and unique chord voicings beyond the conventional major/minor tonalities.