5150 (pronounced "fifty-one-fifty") is the seventh studio album by American hard rock band Van Halen, released on March 24, 1986 by Warner Bros. Records. It was the first of four albums to be recorded with lead singer Sammy Hagar, who replaced David Lee Roth. The album was named after Eddie Van Halen's home studio, 5150, in turn named after a California law enforcement term for a mentally disturbed person (a reference to Section 5150 of the California Welfare and Institutions Code). The 5150 name has been used several times by Van Halen. The album hit number 1 on the Billboard 200 chart, surpassing the band's previous album, 1984, which had peaked at number 2 behind Michael Jackson's Thriller album, on which Eddie Van Halen made a guest appearance.