Chicago (band) - Wikipedia
https://en.wikipedia.org/wiki/Chicago_(band)
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.
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