Big Bang Theory es un álbum de estudio de la banda de hard rock estadounidense Styx,[2] publicado en 2005. Consta de 14 versiones de clásicos de bandas como Los Beatles, Procol Harum, The Who y The Jimi Hendrix Experience.
- "I Am the Walrus" (The Beatles)
- "I Can See for Miles" (The Who)
- "Can't Find My Way Home" (Blind Faith)
- "It Don't Make Sense (You Can't Make Peace)" (Willie Dixon)
- "I Don't Need No Doctor" (Ray Charles)
- "One Way Out" (The Allman Brothers Band)
- "A Salty Dog" (Procol Harum)
- "Summer in the City" (The Lovin' Spoonful)
- "Manic Depression" (The Jimi Hendrix Experience)
- "Talkin' About the Good Times" (The Pretty Things)
- "Locomotive Breath" (Jethro Tull)
- "Find the Cost of Freedom" (Crosby, Stills, Nash & Young)
- "Wishing Well" (Free)
- "Blue Collar Man @ 2120"