Kerplunk is the second studio album by the American rock band Green Day, released on December 17, 1991, by Lookout! Records. Following a US tour promoting their debut studio album 39/Smooth (1990), drummer John Kiffmeyer left to attend college and was replaced by Tré Cool, formerly of the Lookouts. By this stage, Green Day's audience expanded to teenage girls from suburban towns. In May 1991, they decamped to Art of Ears Studios in San Francisco, California, to record their next album with Andy Ernst, who co-produced the sessions with band. Six songs were recorded until the proceedings stopped in order for Green Day to resume touring, returning to the studio in September 1991 to finish the work.

Billie Joe Armstrong is an American musician who is the lead vocalist, guitarist, and primary songwriter of the rock band Green Day, which he co-founded with Mike Dirnt in 1987. He is also a guitarist and vocalist for the punk rock band Pinhead Gunpowder, and provides lead vocals for Green Day's side projects Foxboro Hot Tubs, the Network, the Longshot and the Coverups. Armstrong has been considered by critics as one of the greatest punk rock guitarists of all time.