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Contagious is the eighth studio album by American heavy metal band Y&T, released in 1987 through Geffen Records, which, like their previous label A&M Records, is now a subsidiary of Interscope Records (itself owned by Universal Music Group). It is the first Y&T studio album to feature a different line up since their debut album, with Jimmy DeGrasso replacing Leonard Haze on drums after he left the band in 1986.
30,000 albums were pressed with the title "Boys Night Out" instead of "L.A. Rocks." This was due to the song title chosen for that song that came from Jesse Harms (Sammy Hagar's keyboardist at the time) who was working with Dave Meneketti at the time but when Geffen released a Sammy Hagar album using the actual song written by Harms, "Boys Night Out," Y&T was forced to change the title on the insistence of David Geffen.