Smile is an unfinished album by the American rock band the Beach Boys, conceived as the follow-up to their 1966 album Pet Sounds. The project—a concept album involving themes of Americana, humor, youth, innocence, and the natural world—was planned as a twelve-track LP assembled from modular fragments, the same editing process used on their single "Good Vibrations". After a year of recording, the album was shelved and a downscaled version, Smiley Smile, was released in September 1967. Over the next four decades, few of the original Smile tracks were officially issued, and the project became regarded as the most legendary unreleased album in popular music history.     - Wikipedia