1,039/Smoothed Out Slappy Hours

1,039/Smoothed Out Slappy Hours is a compilation album comprising early recordings by American rock band Green Day, released October 1, 1991, on Lookout Records. Often erroneously referred to as the band's debut album, the compilation combines the band's actual debut, 39/Smooth (1990), and its first two EPs, 1,000 Hours (1989) and Slappy (1990) (all currently out of print), as suggested by the amalgamation of the titles of the debut album and two EPs for the resulting compilation album. The album includes one cover, "Knowledge" (originally from the Slappy EP), which was originally by influential California punk band Operation Ivy, whose singer, Jesse Michaels, contributed the artwork for the album. The cover art features the same image from 39/Smooth.