The sessions took place in Columbia's New York studios, converted from an old Greek Orthodox church on 30th Street, below Central Park and well on the way to Greenwich Village, then, as now, the home of most jazz of significance in New York. It's common knowledge now that the master tape used for the album was slightly sharp. Columbia had always used two tape machines, a master and a safety, for recording. In 1992, Mark Wilder, an engineer preparing a reissue, went to the safety, reasoning it was less used, and discovered its pitch was a quarter-tone lower than the album which had been on the market for more than 30 years. Nobody, not even the musicians concerned, had noticed the fault.
All current reissues are at the correct pitch.
The album was released in 1959 to favourable reviews. Musicians liked it, without necessarily immediately grasping fully what it was about. Time has taken care of that, too. It still seems like that.