Chicago is an American rock band formed in February 1967, distinguished by its integration of a horn section with rock instrumentation and influences from classical music, jazz, and R&B. Founding members included Peter Cetera, Terry Kath, Robert Lamm, Lee Loughnane, James Pankow, Walter Parazaider, and Danny Seraphine, and the band has sold over 100 million records worldwide.

The first rock act to sell out Carnegie Hall for a week (1971), Chicago was inducted into the Rock and Roll Hall of Fame in 2016 and received a Grammy Lifetime Achievement Award in 2020.

Sources:

• https://en.wikipedia.org/wiki/Chicago_(band)