"Apple Blossom" is an American reel in cut or 2/4 time and D Major. The parts are played AB (Titon/Bowles), AABB (Phillips, Titon/Monday) or AABBB (Bowles). It is often played in ADae fiddle tuning.
The tune was not widely known outside the northern Tennessee/south-central Kentucky area known as the Cumberland Plateau, but there are several field recordings of fiddlers from the region born in the 19th century playing it.
It was printed in Clare Milliner & Walt Koken's Milliner-Koken Collection of American Fiddle Tunes (2011), Phillips' Traditional American Fiddle Tunes, vol. 1 (1994) and Titon's Old-Time Kentucky Fiddle Tunes (2001).
The version printed in Brody's The Fiddler's Fakebook (1983) is a different tune.
It was recorded by The Renegades on I Need to Find (1995), Jim Bowles on Railroading Through the Rocky Mountains (1994), John Lusk, Murph Gribble and Albert York on Altamont - Black String Band Music From the Library of Congress (1989, originally recorded in 1949) and Bruce Molsky.