‘There is something enviable about the utter lack of inhibition with which Leonard Bernstein carries on,’ wrote the critic of the Boston Globe after the US première of Bernstein’s Third Symphony, Kaddish, in February 1964 — and looking at the forces arrayed at the Barbican, he had a point. In addition to the full LSO there was the London Symphony Chorus, a narrator, a solo soprano and the Tiffin Boys’ Choir.