[3] On the Album In Memoriam, recorded a year before the start of their hiatus, the Modern Jazz Quartet was accompanied by an orchestra conducted by Maurice Peress.

Pianist John Lewis wrote the title composition in tribute to Walter Keller, his piano teacher at the University of New Mexico.

Furthermore, the piece contains homages to Arnold Schoenberg and Igor Stravinsky, prompting Lewis to comment that it "also plays a part in the memorium".

The group had previously recorded the adagio from "Concierto de Aranjuez" with the guitarist Laurindo Almeida on their 1964 album Collaboration.

[1] All compositions by John Lewis except as indicated Musicians Production Kenny Clarke, Mickey Roker, Albert Heath