Styx is an American rock band from Chicago that formed in 1972 and became famous for its albums released in the late 1970s and early 1980s. They are best known for melding hard rock guitar balanced with acoustic guitar, synthesizers mixed with acoustic piano, upbeat tracks with power ballads, and incorporating elements of international musical theatre. The band established itself with a progressive rock sound in the 1970s, and began to incorporate pop rock and soft rock elements in the 1980s.