Chicago is an American rock band formed in 1967, known for their innovative fusion of rock and roll with elements of jazz, classical, and pop music. The band's distinctive sound is characterized by the use of a horn section, which sets them apart from many contemporary rock bands. They have been particularly influential in advancing the concept of album-oriented rock and producing a series of successful ballads in the 1980s. Among their standout members was Terry Kath, a guitarist admired for his powerful vocals and technical proficiency.