The album compiles tracks from the band's 1970s releases on the RCA label, specifically drawing from the albums Fly to the Rainbow, In Trance, Virgin Killer, and Taken by Force. This collection captures the band's early, grittier sound during the era featuring guitarist Uli Jon Roth, before they achieved massive global mainstream success in the 1980s with a more polished pop-metal sound. The songs are known for powerful vocals by Klaus Meine and Roth's distinct, Hendrix-influenced guitar work.