I'm in the mood for a nice ballad. Here's one of my favorites, "Blue in Green"

From the ground breaking record, "Kind of Blue"

Wikipedia: In 1953, pianist George Russell published his Lydian Chromatic Concept of Tonal Organization, which offered an alternative to the practice of improvisation based on chords. Abandoning the traditional major and minor key relationships of Western music, Russell invented a new formulation using scales or a series of scales for improvisations; this approach came to be known as modal in jazz.

Influenced by Russell's ideas, Davis implemented his first modal composition with the title track of his 1958 album Milestones; satisfied with the results, Davis now prepared an entire album based on modality. Key to the realization of these ideas was pianist Bill Evans, also an enthusiast of Russell, but recently departed from the Davis band to pursue his own career. Davis successfully drafted Evans into his new recording project, the sessions that would become Kind of Blue.

The album was recorded in two sessions, on March 2 for the tracks ""So What," "Freddie Freeloader," and "Blue In Green," comprising side one of the original LP, and April 22 for the tracks "All Blues," "Flamenco Sketches," making up side two. As was Davis' penchant, he called for almost no rehearsal and the musicians had little idea what they were to record; as described in the original liner notes by Evans, the band had only sketches of scales and melody lines to go on. Once the musicians were assembled, Davis gave brief instructions for each piece, then set to taping. Excepting false starts, other than the two takes of "Flamenco Sketches" of which the second was released, all of the completed tunes were done in one pass.