The problems seem to have arisen because Mingus had piles of new music in his head, and wanted to stage an open rehearsal which United Artists and producer Alan Douglas wanted to record and release. Then UA moved up the date five weeks, Mingus kept writing even newer music while rehearsals were underway, the musicians were unprepared (the Coss article suggests that in three previous rehearsals not one piece had been played all the way through), and the audience - most of whom were apparently expecting a fully rehearsed concert rather than a taping session with false starts, retakes and edit pieces - was flabbergasted.