On July 5, 1954, the trio met at Sun studios to rehearse and record a handful of songs. According to Moore, the first song they recorded was "I Love You Because", but, after a few other country-oriented songs that weren't all that impressive, they decided to take a break. During the break, Presley began "acting the fool" with Arthur Crudup's "That's All Right (Mama)", a blues song. When the other two musicians joined in, Phillips got them to restart and began taping. This was the bright, upbeat sound he had been looking for. Black remarked, "Damn. Get that on the radio and they'll run us out of town." The group recorded four songs during that session, including bluegrass musician Bill Monroe's "Blue Moon of Kentucky", which he had written and recorded as a slow waltz. Sources credit Bill Black with initiating the song, with Presley and Moore joining in. They ended up with a fast version of the song in 4/4 time. After an early take, Phillips can be heard on tape saying: "Fine, man. Hell, that's different—that's a pop song now, nearly 'bout."