Four Decades is a live album by Eddie Jobson, celebrating the 40th anniversary of his recording career. The album was recorded during one single night in Kawasaki, Japan. The set list is made up by songs from his solo albums and by the artists he has performed with during the course of his career, such as Curved Air, Roxy Music, Frank Zappa, U.K., Bruford and UKZ, thus only excluding his period with Jethro Tull in 1980. Sonja Kristina from Curved Air, John Wetton from UK and Aaron Lippert from UKZ make guest appearances for the material they originally performed on, with the latter also taking vocal duties for two other songs.