In 1948, Miles Davis formed a nonet including Mulligan, Konitz, and Evans from Thornhill's orchestra. Capitol Records recorded the group (at arranger Pete Rugolo's suggestion) in 1949 and 1950. These recordings, originally issued as 78 rpm records, were later compiled as "Birth of the Cool" (1957). Gerry Mulligan explained that the idea behind Davis's Nonet was not to get away from bebop, but "just to try to get a good little rehearsal band together. Something to write for... As far as the 'Cool Jazz' part of it, all of that comes "after" the fact of what it was designed to be." As for Davis, his concern at the time was simply to play with a lighter sound, which he believed to be more expressive. Also his choice of notes suggested deliberation rather than wild exuberance.