Released last May, "Big Bang Theory" houses 14 cuts, including the group's renditions of The Who's "I Can See for Miles," Jimi Hendrix's "Manic Depression" and The Lovin' Spoonful's "Summer in the City." Also featured is a new studio version of Styx's 1978 hit "Blue Collar Man."

Music videos for two additional cuts--The Beatles' "I Am the Walrus" and Steve Winwood's 'Can't Find My Way Home"--are streaming at Styx's website.

Styx's most recent collection of original material is 2003's "Cyclorama." "Come Sail Away: The Styx Anthology," a retrospective set featuring 35 digitally remastered tracks culled from throughout the band's 30-year career, followed in 2004.

"Big Bang Theory" is Styx's first release for New Door Records, a Universal Music Enterprises imprint that launched shortly before the album's release. Universal formed the new label specifically to cross-promote new works by artists who have an existing back-catalog with Universal.

Styx was signed to A&M Records--now part of Universal--from the mid-'70s through the early '90s, then hooked up with CMC International in 1996; the group's final releases for CMC/Sanctuary were 2003's "Cyclorama" and "21st Century Live."