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? 
Sentence (from "Uncle Pen (song)"): Besides Monroe, the song was recorded by Porter Wagoner in 1956, Goose Creek Symphony in 1971, Michael Nesmith of "The Monkees" in 1973 on his solo album "Pretty Much Your Standard Ranch Stash," and Ricky Skaggs in 1984.
Relevant evidence: No