Task: Explanation
Input (English): "Blue Moon of Kentucky" is a waltz written in 1946 by bluegrass musician Bill Monroe and recorded by his band, the Blue Grass Boys. The song has since been recorded by many artists, including Elvis Presley. In 2003, the song was chosen to be added to the United States Library of Congress National Recording Registry. Question: Bill Monroe's bluegrass song Blue Moon of Kentucky was released by Elvis Presley on the B-side of his first ever single. What was that song?  Answer: That's All Right
Output (English): Blue Moon of Kentucky is a waltz written in 1946 by bluegrass musician Bill Monroe and recorded by his band, the Blue Grass Boys.