Blue in Green is an impressionistic jazz ballad first recorded on Miles Davis's Kind of Blue in 1959. Originally credited solely to Davis, the composition is now widely understood to be primarily the work of pianist Bill Evans, who developed it from two chords — G minor and A augmented — that Davis had suggested. According to testimony from pianist Earl Zindars, Evans composed the piece at roughly 4:00 a.m. in Zindars' apartment on his piano, the night before the Kind of Blue recording session. Davis never fully acknowledged Evans's authorship, and Evans did not publicly press the matter during Davis's lifetime, though he pointedly listed himself as composer on his own subsequent recordings, including Portrait in Jazz and the live album Blue in Green — Concert in Canada. The tune's unusual 10-bar cyclic form, preceded by a four-bar piano introduction, sets it apart from the 8-, 12-, and 32-bar structures that dominate the jazz standard repertoire. Its melody is built on lush tensions — ninths, elevenths, thirteenths, and altered tones — floating over modal harmony and Evans's signature open voicings constructed in fourths. Shaped by the influence of George Russell's Lydian Chromatic Concept, the composition helped define the modal jazz movement and remains one of the most distinctive ballads in the canon, recorded by artists ranging from guitar-led groups to solo piano interpretations.