Four books of poetry by Sun Ra: two pamphlets that accompanied early Sun Ra albums issued in the late 1950s — Jazz By Sun Ra (1957) and Jazz In Silhouette (1959) — and two published more than a decade later later by Infinity Inc./Saturn Research: The Immeasurable Equation and the very rare Extensions Out: The Immeasurable Equation Vol. II.

Recorded during the The Futuristic Sounds of Sun Ra sessions in 1961 after moving the Arkestra to the Philadelphia/NY area from his original Chicago base, these two ballads are sung by Ricky Murray, "I Struck a Match..." written by Sun Ra and very much an Arkestra tune, while "Dreamsville" is a Livingston-Mancini-Evans tune that receives Ra's big band treatment.

The two volumes of "Heliocentric Worlds", recorded 7 months apart in 1965, represent perhaps one of greatest chapters in Sun Ra's legacy, bringing together his immense orchestration skills with future-leaning free jazz, allowing his players expanse inside disciplined compositions that reflect on both space and the then-new freedom explored by jazz soloists.

The 2nd volume in Sun Ra's "Discipline" series was recorded during the same sessions as 1972's Impulse release "Space Is the Place", with Sun Ra on electronic keyboards and Moog, and a large band including Marshall Allen, John Gilmore, Danny Davis, Akh Tal Ebah, June Tyson, &c.