Dennis DeYoung is an American singer, songwriter and keyboardist. He was a founding member of the rock band Styx and served as its primary lead vocalist and keyboardist from 1972 until 1999. DeYoung was the band's most prolific and successful writer, having been credited as the writer of more Styx songs than any other band member. DeYoung penned seven of the band's eight Billboard top 10 singles as well as a solo top 10 single.

Styx is an American rock band formed in Chicago, Illinois, in 1972. They are known for blending melodic hard rock guitar with acoustic guitar, synthesizers mixed with acoustic piano, upbeat tracks with power ballads, and incorporating elements of international musical theatre. The band established themselves with a progressive rock sound during the 1970s, and began to incorporate pop rock and soft rock elements in the 1980s.