He was responsible for popularizing the term "white spirituals" to describe the "fasola" singing.
Jackson argued that Tennesseans in the Antebellum South were "far more musically active" than after the war.
[2] Additionally, Jackson argued that Negro spirituals took their origin from poor whites who sang old folk songs from England.
He proposed the now generally accepted view that the original tunes used in Der Ausbund hymnal were popular medieval melodies.
[4] Der Ausbund is still used by Amish groups and has the distinction of being the hymnal with a history of the longest continual use (1564 to the present; the latest edition being published in 1999).