1,039/Smoothed Out Slappy Hours is a compilation album consisiting of Green Day's first full-length album, 39/Smooth, and their first two EPs, 1,000 Hours and Slappy. This album is often called Green Day's first album, most likely because it was the first album to be released in CD version, while 39/Smooth, Slappy, and 1,000 Hours were only released in LP version.