Charles Mingus's Jazz Workshop Concerts are being released by Mosaic Records on a 6CD set. The concerts, from 1964–5 feature Eric Dolphy, Jaki Byard, Dannie Richmond, Johnny Coles and Clifford Jordan, from New York, Amsterdam, Minneapolis and Monterey.
The Jazz Workshop was Mingus's ensemble of a rotating set of players, where pieces were developed through repeated rehearsals of a set of core tunes. Performances involved on the spot improvisation with Mingus often shouting instructions, stopping play to correct mistakes, and tell off inattentive audiences.
The booklet for Charles Mingus: The Jazz Workshop Concerts 1964–65 contains photos, liner notes by Mingus biographer Brian Priestley, plus an essay by Sue Mingus. The set is printed in an edition of 7,500, and is due for release on 18 September. More details here.