There is an a cappella version of Amazing Grace sung to a different tune on "Classic Mountain Songs from Smithsonian Folkways". The singer is Horton Barker, and the track was recorded in 1962. Horton sang what he called the "old melody", which he learned from a neighbor. The notes say "Amazing Grace", credited to John Newton (1725-18097), was first published in 1779, but they neglect to mention whether any music was published with it. Those of you sick to death of the usual tune might appreciate this alternative.
--Rob