What convention, Hank? Evidently the text describes the American Guild of Organists event in the 1980s at which Rozsa's last orchestral composition was introduced. But what are you quoting from?

The musical program, or programs (perhaps spread over several days?), is remarkably diverse. And much of it is not really organ music. The RVW Mass is essentially a choral piece. And the Brant is . . . as the writer describes. Brant, by the way, was a longtime associate of Alex North's who contributed somehow to SPARTACUS and CLEOPATRA.