Question: Who rejoined the Backstreet Boys who was also inducted into the Kentucky Music Hall in April 10, 2015?

<P0-S0> Backstreet Boys: Show 'Em What You're Made Of is a 2015 American documentary film about the career of the American vocal group Backstreet Boys, released on January 30, 2015 in the U.S., and was released on February 26, 2015 in the UK and Europe, and March 28, 2015 for the rest of the world. <P0-S1>  It was directed by Stephen Kijak. <SEP> <P1-S0> Kevin Scott Richardson (born October 3, 1971) is an American singer, songwriter, actor and model, best known as a member of the Backstreet Boys. <P1-S1>  Richardson was inducted into the Kentucky Music Hall of Fame along with his cousin and bandmate Brian Littrell on April 10, 2015. <SEP> <P2-S0>  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. <P2-S1>  It has been said that he played every instrument at one time or another in the Monroe group except mandolin. <P2-S2>  Curly Ray also played with the Stanley Brothers at a different time as their fiddler. <P2-S3>  (At the time, the Opry had bleachers for family just off stage). <P2-S4>  Charlie spent most of 1953 back with the Lonesome Pine Fiddlers working at WJR radio in Detroit. <P2-S5>  By 1958, Charlie (electric lead guitar) and his wife, Lee (electric bass), had rejoined Ezra and Curly Ray in the Lonesome Pine Fiddlers, who were experimenting with a more modern sound and working a TV show in Huntington, West Virginia, in addition to daily radio in Pikeville. <P2-S6>  He also worked briefly as a sideman with the Osborne Brothers, although he did not record with them. <P2-S7>  The Clines came from a large family consisting of musically talented people. <P2-S8>  Charlie returned to the Fiddlers briefly before becoming a member of Bill Monroe's Blue Grass Boys. <P2-S9>  Curly Ray was one of the best fiddlers in Bluegrass. <P2-S10>  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. <P2-S11>  None of them ever had a music lesson yet excelled on every instrument they touched. <P2-S12>  Finally, on October 1, 2009, The Lonesome Pine Fiddlers got their due when they were inducted into the International Bluegrass Hall of Fame at the Ryman Theater (the original home of the Grand Ole Opry). <P2-S13>  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. <P2-S14>  Bobby Osborne, Melvin Goins and Paul Williams were there to receive the bands award. <SEP> <P3-S0> "Bigger" is a song by American boy band Backstreet Boys. <P3-S1>  It was released on November 29, 2009 as the second single from their seventh studio album, "This Is Us" (2009). <P3-S2>  The song was co-written and produced by collaborator and producer Max Martin. <P3-S3>  This was the last standard Backstreet Boys single released before Kevin Richardson rejoined the group. <P3-S4>  The band stated that the song was one of their best hits since "I Want It That Way", a song written and produced by Martin for the band in 1998.