O Holy Night by Adolphe Adam is arranged here by Peter Covino, Jr., for SATB and orchestra. This arrangement modulates everywhere. Order by mail here for $75.00, includes parts. Choral parts sold separately at this site. Free LDS choir sheet music, hymn arrangements, and piano and voice songs are available here. Db and Bb version are available.
Several other combinations of ensembles are available at this site.
To listen, click here: Not a perfect synthesized recording but you get the flavor of it.