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? 

<P0-S0>  It is best known as the first single recorded and released by Elvis Presley. <P0-S1> "That's All Right" is a song written and originally performed by blues singer Arthur Crudup. <P0-S2>  Presley's version was recorded on July 5, 1954, and released on July 19, 1954 with "Blue Moon of Kentucky" as the B-side. <P0-S3>  It is #113 on the 2010 "Rolling Stone" magazine list of the "500 Greatest Songs of All Time". <SEP> <P1-S0>  Curly Ray was one of the best fiddlers in Bluegrass. <P1-S1>  In the crowd of a sold out theater was the son of Ezra Cline, Scotty Ireland Cline, who recalled being in that same theater as a child sitting on stage and watching the Fiddlers play. <P1-S2>  Ray and Charlie's father, Charlie, was a talented banjo player and the women in the family, Geraldine and Bobbi, were great singers. <P1-S3>  In 1954, Charlie did a session, playing lead guitar, with the Stanley Brothers and also another one on RCA with the Fiddlers, although he was not otherwise working with them at the time. <P1-S4>  Charlie spent most of 1953 back with the Lonesome Pine Fiddlers working at WJR radio in Detroit. <P1-S5> The Lonesome Pine Fiddlers (1938- 1966) were an early bluegrass band which included such notable "first generation" bluegrass musicians as Ezra Cline, Bobby Osborne, Paul Williams, Melvin Goins, Charlie Cline, Curly Ray Cline, Larry Richardson and for a short time Jimmy Martin. <P1-S6>  (At the time, the Opry had bleachers for family just off stage). <P1-S7>  During 1952-1955, Charlie worked off and on with Monroe, recording some 38 songs, all on Decca. <P1-S8>  The final act of the evening at the IBMA Awards was the playing of "Pain in my Heart" by Osborne, Goins and Williams along with a Song from the Dillards, who were also inducted the same evening. <P1-S9>  The Clines came from a large family consisting of musically talented people. <P1-S10>  He also worked briefly as a sideman with the Osborne Brothers, although he did not record with them. <P1-S11>  When the Pine Fiddlers resumed regular daily broadcasts, Charlie, who played multiple instruments, joined them on a regular basis. <P1-S12>  Curly Ray also played with the Stanley Brothers at a different time as their fiddler. <P1-S13>  In his later years, Charlie was with the Stanley Brothers. <P1-S14>  Natives of the Gilbert Creek region of southern West Virginia, Cousin Ezra, along with brothers Ireland (Lazy Ned) and Curly Ray Cline, were part of the original Lonesome Pine Fiddlers from about 1938, a group that worked on radio at WHIS Bluefield, West Virginia. <SEP> <P2-S0>  The song has since been recorded by many artists, including Elvis Presley. <P2-S1>  In 2003, the song was chosen to be added to the United States Library of Congress National Recording Registry. <P2-S2> "Blue Moon of Kentucky" is a waltz written in 1946 by bluegrass musician Bill Monroe and recorded by his band, the Blue Grass Boys. <SEP> <P3-S0> The Bluegrass Album is the nineteenth studio album, and the first bluegrass album by American country music artist Alan Jackson. <P3-S1>  It was released on September 24, 2013 via Alan's Country Records and EMI Nashville. <P3-S2>  Jackson wrote eight songs for the album. <P3-S3>  It also includes covers of The Dillards' "There Is a Time", John Anderson's "Wild and Blue" and Bill Monroe's "Blue Moon of Kentucky". <P3-S4>  Also included is a re-recording of "Let's Get Back to Me and You" from his 1994 album "Who I Am", marking the second time Jackson has included two versions of the same song on two different albums ("A Woman's Love" was originally recorded for "High Mileage" and was later re-recorded for "Like Red on a Rose").