Birth of the Cool is a compilation album by American jazz musician Miles Davis, released in 1957 on Capitol Records. It compiles eleven tracks recorded by Davis's nonet for the label over the course of three sessions during 1949 and 1950. Featuring unusual instrumentation and several notable musicians, the music consisted of innovative arrangements influenced by classical music techniques such as polyphony, and marked a major development in post-bebop jazz. As the title suggests, these recordings are considered seminal in the history of cool jazz.

The nonet recorded twelve tracks for Capitol during three sessions over the course of nearly a year and a half. Davis, Konitz, Mulligan and Barber were the only musicians who played on all three sessions, though the instrumental lineup was constant (excepting the omission of piano on a few songs and the addition of Hagood on "Darn That Dream"). The first session occurred on January 21, 1949, recording four tracks: Mulligan's "Jeru" and "Godchild" as well as Lewis's "Move" and "Budo". Jazz critic Richard Cook hypothesizes that Capitol, wanting to get a good start, recorded these numbers first because they were the most catchy tunes in the nonet's small repertoire. That date Kai Winding replaced Zwerin on trombone, Al Haig replaced Lewis on piano, and Joe Shulman replaced McKibbon on bass.  The second recording date came three months later on April 22, 1949 with Davis filling in for Fats Navarro in Tadd Dameron's band with Charlie Parker during the interim. The band returned to the studio with five substitutions in personnel: J. J. Johnson on trombone, Sandy Siegelstein on French horn, Nelson Boyd on bass, and Kenny Clarke on drums, and John Lewis returning to piano. At this session, the nonet recorded Mulligan's "Venus de Milo", Lewis's "Rouge", Carisi's "Israel", and "Boplicity", a collaboration between Davis and Evans, credited to the pseudonym "Cleo Henry".  The band did not return to the studio again until March 9, 1950. Davis did not call the band for any rehearsals or live performances between the second and third recording dates. The March 1950 date featured Mulligan's "Darn That Dream", "Rocker", and "Deception", and Evans's arrangement of Chummy MacGregor's "Moon Dreams", which had been released in a jazz arrangement by Glenn Miller and the AAF Band in 1944 on V-Disc. The band saw more substitutions, with Gunther Schuller on French horn and Al McKibbon on bass. Kenny Hagood returned for vocals on "Darn That Dream".Answer this question using a quote from the following article:

How was it recorded?
recorded twelve tracks for Capitol during three sessions over the course of nearly a year and a half. Davis, Konitz, Mulligan and Barber were the only musicians who played on