Here's the link Sheila was trying to give. The corrent domain was missing.

It was mentioned by WILLIAM HOGELAND in a Nov. 21 New York Times column:
Sacred Harp
At homepage.mac.com/callistc/SacredHarpSingersintro.html, you can download 22 free MP3 performances by some of the best singers of the roof-raising hymn style known as Sacred Harp, recorded in the 1970's in Bremen, Ga. (File names, worth browsing in themselves, include "145 Sweet Affliction" and "Arbacoochee.") Revivalists sometimes can't help crisping up the Sacred Harp sound, but these singers were full of unpretty enthusiasm. And the recordings let you hear the timbers groan and buzz.