Short answers, pulled from the story.
The band Chicago formed on the 15th of February 1967 with original members Walter Parazaider, James Pankow, Lee Loughnane, Terry Kath, Danny Seraphine, and Robert Lamm. Peter Cetera joined the group in late 1967 to complete the seven-piece ensemble.
The group originally operated under the name The Big Thing before changing their name to Chicago Transit Authority in 1968. They shortened the name to Chicago later to avoid legal issues with the actual transit authority.
Guitarist and vocalist Terry Kath died on the 23rd of January 1978 in an accidental self-inflicted gunshot wound. Donnie Dacus replaced him in April 1978 after the band auditioned over 30 potential replacements.
The album Chicago 17 released in 1984 became the band's biggest-selling album and was certified six times multi-platinum by the RIAA. It produced two top-ten singles written by Peter Cetera and David Foster.
The band Chicago was inducted into the Rock and Roll Hall of Fame in 2016 and the Songwriters Hall of Fame in 2017. These honors recognized their legacy and influence on the music industry.