Liza Jane Alexander, a second grade teacher in her day job, playing her banjo and singing for the museum visitors.
Per Wikipedia: Appalachian musicians were a key influence on the early development of old time music, country music and bluegrass and were an important part of the American folk music revival of the 1960s. Instruments typically used to perform Appalachian music include the banjo, fiddle, fretted dulcimer and guitar.