“Long ago, I wrote in the Guardian that a 1980 London performance by the Art Ensemble of Chicago – Lester Bowie (trumpet), Joseph Jarman (saxes), Malachi Favors Maghostut (bass), Roscoe Mitchell (sax and composition) and Famoudou Don Moye (percussion) – had felt “like a sermon, a drama … and a history lesson all at once”. The late great American jazz sage Nat Hentoff went further, suggesting the ba”