シンフォニーホール
"Slavery Documents", an oratorio in two parts for 80-voice chorus, five soloists, and large orchestra (including an organ), is Sur's only large-scale work, and the one for which he is most remembered. A commission from the Cantata Singers and Ensemble, it premiered at Symphony Hall, Boston, on 23 March 1990, conducted by David Hoose. Sur wrote the libretto himself based on a variety of texts and documents relating to slavery, including passages from the Bible, Cotton Mather's "The Negro Christianised", the 1831 confessions of Nat Turner, descriptions of slave punishments published by the American abolitionist Theodore Weld in "", pre-Civil War advertisements for runaway slaves, Negro spirituals, and Stephen Foster's sentimental ballad "Old Folks at Home".