O Magnum Misterium (long setting) Type Piece Composer John Harbison Year Composed 1992 Group C4 Performances C4: 2009 June 4 & 6 (American Voices), cond. Baum; C4: 2011 Nov 17 & 19 (Ecstatic), cond. Siadat Categories A cappella, C4, Piece Tags John Harbison
