"Harmonique" is an original composition by John Coltrane, recorded during the 1959-1960 sessions for his Coltrane Jazz album (Atlantic Records, 1961). The piece is a blues in B-flat set in 3/4 time, giving it a distinctive waltz-like rhythmic feel within the blues form. Its most remarkable feature is Coltrane's pioneering use of multiphonics -- an extended saxophone technique in which the player produces multiple notes simultaneously -- over the melody and into the first chorus of soloing. This represents one of the earliest documented examples of chordal saxophone playing in a jazz recording, building on traditions of overblowing and false fingerings while advancing into genuinely polyphonic territory within a tonal blues framework. The composition was crafted specifically to accommodate this technique, with the melody designed to support the production of multiphonic chords. "Harmonique" emerged during a transitional period in Coltrane's career as he established himself as both a master improviser and an innovative composer. While the Coltrane Jazz album is sometimes overshadowed by its contemporaries Giant Steps and My Favorite Things, it introduced several important originals that pointed toward Coltrane's groundbreaking quartet era. "Harmonique" remains a relatively deep cut rather than a widely performed standard, but it is recognized among saxophonists for its technical legacy and its role in expanding the expressive vocabulary of the instrument.