In November 1964, a number of New York musicians (including Sun Ra) formally banded together as the Jazz Composers Guild. Under JCG sponsorship, the series “Four Days in December” ran from December 28 through 31 at Judson Hall. Sun Ra and his Arkestra appeared on the 31st, along with the New York Art Quartet. All of the music from the Four Days in December series was recorded by the JCG for its own label; a December 1964 announcement in Down Beat indicates that a sampler LP was planned as the first release. However, the Guild broke apart early in 1965, so this never came to pass. Later there were plans (again abortive) to issue the concerts on the Fontana label. Almost a dozen years later (1976), Sun Ra issued the LP "Featuring Pharoah Sanders and Black Harold" [comprised of tracks 6–11 of this digital edition].
When Angels Speak of Love, released in 1966 on Sun Ra's Saturn label, is a rarity, there having been limited pressings (150 copies, by one estimate), which were sold thru the mail and at concerts and club dates. The tracks were taped in New York during two 1963 sessions at the Choreographer's Workshop, a rehearsal space/recording den with warehouse acoustics. Ra spent countless hours at the CW from 1961 to 1964 sharpening the Arkestra during exhaustive musical huddles. John Corbett calls this "one of the most continuous, best-documented periods of Ra's work"; much tape from these seminal sessions has survived and been issued on LP, CD and digitally.