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

<P0-S0> The OU812 Tour was a concert tour by hard rock band Van Halen. <P0-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). <P0-S2>  It followed the Monsters of Rock Tour 1988, which had formed the first part of the promotion for the "OU812" album. <SEP> <P1-S0>  Bobby Osborne, Melvin Goins and Paul Williams were there to receive the bands award. <P1-S1>  Charlie spent most of 1953 back with the Lonesome Pine Fiddlers working at WJR radio in Detroit. <P1-S2>  For reasons unknown, Bobbi and Geraldine never joined the band on the road but often joined in at home, especially when notable Country singers, such as Bill Monroe, Lester Flatt and Earl Scruggs, and Hank Williams, came visiting. <P1-S3>  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. <P1-S4>  None of them ever had a music lesson yet excelled on every instrument they touched. <P1-S5>  The Clines came from a large family consisting of musically talented people. <P1-S6>  This most talented family of musicians were the best, surpassed by none. <P1-S7>  He also worked briefly as a sideman with the Osborne Brothers, although he did not record with them. <P1-S8> 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-S9>  When the Pine Fiddlers resumed regular daily broadcasts, Charlie, who played multiple instruments, joined them on a regular basis. <P1-S10>  Ray and Charlie's father, Charlie, was a talented banjo player and the women in the family, Geraldine and Bobbi, were great singers. <P1-S11>  During World War II, Ned was killed in action. <P1-S12>  When Ezra brought the band to Pikeville, Kentucky, in November, Charlie rejoined Bill Monroe. <P1-S13>  During 1952-1955, Charlie worked off and on with Monroe, recording some 38 songs, all on Decca. <P1-S14>  (At the time, the Opry had bleachers for family just off stage). <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>  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. <P2-S3>  Hagar let Eddie in, and the two played guitars in his balcony until they had a completed song. <P2-S4>  Once Eddie left, Hagar decided to write the lyrics despite being late at night. <P2-S5>  The theme wound up being unfulfilled sex, summed up by Hagar as "blue balls. <P2-S6>  In the song, Eddie Van Halen recorded his guitar part on a Fender Stratocaster plugged direct into the studio mixing console. <SEP> <P3-S0>  Van Halen started work on the album in September 1987 and completed it in April 1988, just one month before its release. <P3-S1> 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.