Styx

Styx is an American rock band from Chicago that formed in 1970 and became famous for its albums released in the late 1970s and early 1980s. They are best known for melding the style of pop rock and hard rock with the power of a hard-rock guitar balanced with acoustic guitar, synthesizers mixed with acoustic piano, upbeat tracks with power ballads, and incorporating elements of international musical theater.

From Wikipedia.org