Chicago is an American rock band formed in Chicago in 1967. The group began calling itself the Chicago Transit Authority (after the city's mass transit agency) in 1968, then shortened the name in 1969. Self-described as a "rock and roll band with horns", Chicago was much influenced by jazz in its early years, and its songs often also combine elements of classical music, R&B, and pop music.
Growing out of several bands from the Chicago area in the late 1960s, the line-up consisted of Peter Cetera on bass, Terry Kath on guitar, Robert Lamm on keyboards,
Lee Loughnane on trumpet, James Pankow on trombone, Walter Parazaider on woodwinds, and Danny Seraphine on drums. Cetera, Kath, and Lamm shared lead vocal duties. Laudir de Oliveira joined the band as a percussionist and second drummer in 1974, remaining with the band until 1981. Kath died in 1978, and was replaced by several guitarists in succession. Bill Champlin joined in 1981, providing vocals, keyboards, and rhythm guitar. Cetera left the band in 1985 and was replaced by Jason Scheff. Seraphine left in 1990 and was replaced by Tris Imboden. Although the band's lineup has been more fluid since 2009, Lamm, Loughnane, and Pankow have remained constant members. Parazaider "officially retired" in 2017. In 2021 he revealed he had been diagnosed with Alzheimer's disease.
In September 2008, Billboard ranked Chicago at number thirteen in a list of the top 100 artists of all time for Hot 100 singles chart success, and ranked them at number fifteen on that same list in October 2015. Billboard also ranked Chicago ninth on the list of the 100 greatest artists of all time in terms of Billboard 200 album chart success in October 2015. Chicago is one of the longest-running and most successful rock groups, and one of the world's best-selling groups of all time, having sold more than 100 million records. In 1971, Chicago was the first rock act to sell out Carnegie Hall for a week.

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