This tune was first released on John Coltrane's Crescent album in 1964. The melody and most of the chords are constructed from the C Dorian mode.
I've transcribed the piece from Kenny Garrett's "Pursuance: The Music of John Coltrane" - it's a terrific recording! Garrett's arrangement deals with alternating 3/4, 5/4 and 4/4 passages. Note that the 5/4 time is broken down as 3/4 + 2/4, which makes the basic repeating rhythmic figure look like 3/4 + 3/4 + 2/4. In spite of the rather complex metric structure, the tune has a strong jazz waltz-like feel throughout. Also, the continuous rhythmic pattern gives the mournful melody a nice boost.