The only boxed set covering their entire 36-year career. Produced with Chicago's involvement, this massive collection gathers over 100 songs on five CDs. It features hit singles, classic album cuts, band favorites, and three previously unreleased tracks from the fan-requested Stone Of Sisyphus project. A bonus DVD contains rare 1972 concert performances and a promotional film for Chicago XIII. Extensive liner notes include two essays, detailed track-by-track analysis, and a ton of archival photos.