Chicago ranks among the all-time most successful groups in American rock. When it was first released as a four-LP package in 1972, this marathon live recording hit #3 on Billboard's Pop album chart and was certified RIAA gold. Following up their 1969 debut album, Chicago Transit Authority, 1970's Chicago II, and 1971's Chicago III-#17, #4, and #2 respectively-this historic set features all their early hits and spotlights Chicago at the pinnacle of their inital success. Painstakingly remastered, it now features a full disc of previously unreleased material showcasing their trademark horns, Robert Lamm's keyboards and vocals, along with the underappreciated guitar virtuosity of the late Terry Kath.