Question: OU812 was the second album to feature a vocalist that also played what instrument in "Finish What Ya Started"?

<P0-S0>  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. <P0-S1>  During 1952-1955, Charlie worked off and on with Monroe, recording some 38 songs, all on Decca. <P0-S2>  Curly Ray also played with the Stanley Brothers at a different time as their fiddler. <P0-S3>  This most talented family of musicians were the best, surpassed by none. <P0-S4>  Ray and Charlie's father, Charlie, was a talented banjo player and the women in the family, Geraldine and Bobbi, were great singers. <P0-S5>  He also worked briefly as a sideman with the Osborne Brothers, although he did not record with them. <P0-S6>  Charlie spent most of 1953 back with the Lonesome Pine Fiddlers working at WJR radio in Detroit. <P0-S7>  The Clines came from a large family consisting of musically talented people. <P0-S8>  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. <P0-S9>  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). <P0-S10>  When the Pine Fiddlers resumed regular daily broadcasts, Charlie, who played multiple instruments, joined them on a regular basis. <P0-S11>  It has been said that he played every instrument at one time or another in the Monroe group except mandolin. <P0-S12>  When Ezra brought the band to Pikeville, Kentucky, in November, Charlie rejoined Bill Monroe. <P0-S13>  Charlie returned to the Fiddlers briefly before becoming a member of Bill Monroe's Blue Grass Boys. <P0-S14>  In his later years, Charlie was with the Stanley Brothers. <SEP> <P1-S0> The OU812 Tour was a concert tour by hard rock band Van Halen. <P1-S1>  It was the second tour to include dates in Japan, and was the second with Sammy Hagar as vocalist (who had settled into the role more by this point). <P1-S2>  It followed the Monsters of Rock Tour 1988, which had formed the first part of the promotion for the "OU812" album. <SEP> <P2-S0> "Finish What Ya Started" is a song by Van Halen taken from their 1988 album "OU812". <P2-S1>  Despite the album being seemingly complete, Eddie Van Halen came up with the riff at 2 in the morning and went down to his then-neighbor Sammy Hagar to show it. <P2-S2>  Hagar let Eddie in, and the two played guitars in his balcony until they had a completed song. <P2-S3>  Once Eddie left, Hagar decided to write the lyrics despite being late at night. <P2-S4>  The theme wound up being unfulfilled sex, summed up by Hagar as "blue balls. <P2-S5>  In the song, Eddie Van Halen recorded his guitar part on a Fender Stratocaster plugged direct into the studio mixing console. <P2-S6>  The song is one of only two Van Halen tracks featuring Sammy Hagar playing a rhythm guitar part, which he played on a Gibson acoustic. <SEP> <P3-S0> OU812 (pronounced "Oh You Ate One Too") is the eighth studio album by American hard rock band Van Halen, released in 1988, and the second to feature vocalist Sammy Hagar. <P3-S1>  Van Halen started work on the album in September 1987 and completed it in April 1988, just one month before its release.