5150 (pronounced "fifty-one-fifty") is the seventh studio album by American hard rock band Van Halen, released in 1986 on Warner Bros. Records. It was the first to be recorded with new lead singer Sammy Hagar, who replaced David Lee Roth.
It was named after Eddie Van Halen's home studio, 5150, which is a California police 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 at the same time as Michael Jackson's Thriller album, on which Eddie made a guest appearance.
Before the album was released, Van Halen had considerable difficulty finding a replacement for the popular David Lee Roth. To make matters worse, Warner Bros. Records advised them to discontinue the Van Halen name; in the beginning of 1986, Eddie and Alex Van Halen formally refused. The trio even considered a series of temporary singers to replace Roth, including Patty Smyth, Eric Martin and Jimmy Barnes. However in July 1985, Eddie met former Montrose singer Sammy Hagar while getting a mechanic to work on his Lamborghini. The pair hit it off and the new singer and band immediately began work on new songs.
Van Halen went to work on the album in November 1985; it would be finished in February 1986, just one month before its release.