There were a lot of heavy metal bands in the 1980s and there were a lot of pop bands too; there weren't many who combined the two styles as well as Def Leppard did. This is a statement that the simply titled The CD Collection, Vol. 1 proves over and over during the course of its playing time. Made up of the four albums the band released during the 1980s, a live show recorded in 1983 (which was issued as part of the deluxe edition of Pyromania), a disc of B-sides and rarities, and a mini-disc of the band's self-titled 1979 EP, the set is filled with razor-sharp riffs, hooky choruses, thudding backbeats, inferno-hot guitar soloing, keening vocal harmonies, and the inimitable yelp of singer Joe Elliott as it runs through their early career. Starting with the EP, it's plain that Def Leppard had the goods right away, but all they needed was a producer to help them clean it up a little.