The most comprehensive website of which we're aware is Pilgrim Production which has links to mp3s of many different all-day singings and probably has one for 98% of the songs in the 1991 Denson Sacred Harp.
Regan From the Alabama Center for Traditional Culture. Real Audio. 276 K.
The Golden Harp, by the Davis Bros. Quartet. From Alabama Center for Traditional Culture (Mac users may have problems with truncation of the file name). Real Audio.
Glory Shone Around. From Alabama Center for Traditional Culture. Real Audio.
Wondrous Love From the Library of Congress American Memory Collections. Sounds like the record got stuck at one point. .mp3.
Schenectady From Library of Congress American Memory Collections. "Prettified" version by Stanford University Chorus, 1939. .wav format.
Great God, Attend From Library of Congress American Memory Collection. Fort Valley State College Folk Festival, collected September 1938.
Jubilee Fort Valley State College Folk Festival, 1938. Library of Congress American Memory Collection. .mp3, 457743 bytes