Chicago is an American rock band formed in 1967 in Chicago, Illinois, calling themselves the Chicago Transit Authority in 1968 before shortening the name in 1969. The self-described “rock and roll band with horns” blended elements of classical music, jazz, R&B, and pop music. They began writing songs with politically charged lyrics, and later moved to a softer sound, generating several hit ballads. The group had a steady stream of hits throughout the 1970s and 1980s. 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 the same list produced in October 2015.[1][2][3] 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.[4] 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.[5][6] In 1971, Chicago was the first rock act to sell out Carnegie Hall for a week.[7]
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