Airs Friday, February 27, at 9 p.m. Sister Rosetta Tharp electrified 1930s audiences with her singing and guitar playing. "The Godmother of Rock and Roll" influenced the music of Elvis Presley, Jerry Lee Lewis, Little Richard, and Johnny Cash. Plus, a celebration of the "Affrilachian Poets". And, accents can be endearing but southern and African American students often pay a price in the classroom for their dialects.