This is a short clip from The Story of the Sacred Harp 1844-1944: How the Sacred Harp Came to Be and How It Grew (a page maintained by Texas FaSoLa). Breedlove is mentioned as a crony of the original publisher in the last paragraph I clipped:

The Sacred Harp was widely used from the start. It was the official song book of the Southern Musical Convention (organized at Huntersville, Upton County, Georgia, 1845), The Chattahoochee Musical Convention (organized at Macedonia Church, Coweta County, Georgia, 1852), the Tallapoosa Singing Convention (organized in Haralson County, Georgia, in 1867), and of countless other conventions organized during the following decades in the territory including Georgia and stretching westward with the tide of migration as far as Texas and Oklahoma.

Sacred Harp singing has never spread, as a real country institution, farther north than the southern reaches of Tennessee and Missouri. In the Carolinas the Southern Harmony and other books seem to have offered stiff competition. The most recently organized convention, one which is at the same time the farthest north, is the Tennessee Sacred Harp Singing Association, organized in 1939 and meeting in Nashville.

Major Benjamin Franklin White (he gained this title in the Georgia militia before the Civil War) died in Atlanta, Georgia, in 1879, and is buried in the Oakland Cemetery in that city beside his wife under a beautiful memorial stone set by kindred and Sacred Harp singers. James says that just before he died he sang plainly and distinctly "Behold, the morning sun begins his glorious way" (Sacred Harp, p. 391).

Among the offspring of B. F. White who carried on after their father ceased to labor were J. L. White, D. P. White, W. D. White, R. H. White, B. F. ("Frank") White, Jr., Mary Caroline (White) Adair, Nancy Ogburn (White) Byrd, and Mrs. E. H. Clarke. And these were followed in the work by large numbers of White's grandchildren and great-grandchildren, some of whom are still active singers today.

Among those prominently associated with the Whites were James R. Turner (b. 1807), J. P. Rees (b. 1828), H. S. Rees (his twin brother), I. M. Shell (b. 1826), Absalom Ogletree (b. 1819), Edmund Dumas, Leonard P. Breedlove, S. R. Pennick, R. F. M. Mann, E. L. King, E. T. Pounds, R. F. Ball, J. T. Edmonds, and Marion Patrick.