Who successfully "crossed over" to pop music and was one of the most influential, successful and acclaimed vocalists of the 20th century, who released an EP on April 20, 1962 ?
Patsy Cline:  Part of the late 1950s/early 1960s Nashville sound, Cline successfully "crossed over" to pop music and was one of the most influential, successful and acclaimed vocalists of the 20th century.
i don't know