Question: 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 ?
Sentence (from "Patsy Cline"): Patsy Cline (born Virginia Patterson Hensley; September 8, 1932 – March 5, 1963) was an American country music singer.
Relevant evidence: No