That Dolly CD is in our player in the kitchen more often than not! I would state that some differences in Bluegrass and Appalachian lies in tempo, bluegrass being generally faster, instrumentation, appalachian often times being acapella or primitive instrumentation such as mouth bow, jews harp, diddlystring or bones, where as bluegrass is a touch more slick, with guitars, banjos, mandolin and fiddle being present most all of the time. The rhythm and cadence of appalachian rings of old irish and english balladry and poetry more than bluegrass as well. Think of appalachian to bluegrass as slave songs are to blues.