Styx ( /ˈstɪks/) is an American rock band that became famous for its albums from the late 1970s and early 1980s. The Chicago band is known for melding the style of prog-rock with the power of hard rock guitar, strong ballads, and elements of American musical theater.

The band is best known for the hit songs "Lady" (#6, 1975), "Come Sail Away" (#8, 1977), "Babe" (#1, 1979), "The Best of Times" (#3, 1981), "Too Much Time on My Hands" (#9, 1981), and "Mr. Roboto" (#3, 1983). Other hits by the band include "Show Me the Way" (#3, 1990), "Don't Let It End" (#6, 1983), and "Renegade" (#16, 1978). The band has four consecutive albums certified multi-platinum by the RIAA.

Twin brothers Chuck and John Panozzo first got together with their neighbor Dennis DeYoung in 1961 in the Roseland section of the south side of Chicago, eventually taking the band name "The Tradewinds". Chuck Panozzo left to attend seminary school for a year but returned to the group by 1964. Tom Nardini had been brought in to replace Chuck on guitar and Chuck decided to play bass guitar when he returned to the band. John Panozzo was the drummer, while Dennis DeYoung had switched from accordion to organ and piano. In 1965, the name "Tradewinds" was changed to TW4 after another band called The Trade Winds broke through nationally. By 1966, the Panozzo brothers had joined DeYoung at Chicago State University and kept the group together doing gigs at high schools and frat parties while studying to be teachers. In 1969 they added a college buddy, John Curulewski, on guitar after Tom Nardini departed. Guitarist James "J.Y." Young came aboard in 1970 making TW4 a quintet.

The Styx (Ancient Greek: Στύξ, also meaning "hate" and "detestation") (adjectival form: Stygian,  /ˈstɪdʒiən/) is a river in Greek mythology that formed the boundary between Earth and the Underworld (often called Hades which is also the name of this domain's ruler). The rivers Styx, Phlegethon, Acheron, and Cocytus all converge at the center of the underworld on a great marsh, which is also sometimes called the Styx. The other important rivers of the underworld are Lethe, Eridanos, and Alpheus.

The gods were bound by the Styx and swore oaths on it.Zeus swore to give Semele whatever she wanted and was then obliged to follow through when he realized to his horror that her request would lead to her death. Helios similarly promised his son Phaëton whatever he desired, also resulting in the boy's death. According to some versions, Styx had miraculous powers and could make someone invulnerable. According to one tradition, Achilles was dipped in it in his childhood, acquiring invulnerability, with exception of his heel, by which his mother held him. This is the source of the expression Achilles' heel, a metaphor for a vulnerable spot.

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Dennis DeYoung (born February 18, 1947) is an American singer, songwriter, musician and producer best known for being a founding member of the rock band Styx as lead vocalist, keyboardist and primary songwriter, a tenure that lasted from 1961 until June 1999.

Growing up in the Roseland neighborhood in Chicago, Illinois, DeYoung's career as a vocalist started in 1961 at the age of 14 when he teamed up with his 13-year-old neighbors, Chuck and John Panozzo, in a three-piece combo. The trio later added guitarist James Young and John Curulewski to form the band Tradewinds in the late 1960s. The band renamed itself TW4 in 1968 before becoming Styx in 1970.

Before the band met with success, DeYoung spent time as an elementary school teacher in the southern suburbs of Chicago, where he taught music at Kolmar School in Midlothian, Illinois. During this period, the band played a number of small venues and school auditoriums, refining their craft before the song "Lady" propelled them to national, then international, stardom.