III/IV is the 12th studio album by alt-country singer-songwriter Ryan Adams, released on December 14, 2010 through PAX AM. The album is his fifth with backing band The Cardinals, and was recorded in 2006 during the same sessions that yielded Easy Tiger. A double album, III/IV was recorded prior to bassist Catherine Popper's departure, and also marks guitarist and backing vocalist Neal Casal's recording debut for the band.