The Leps — who also include guitarists Phil Collen and Vivian Campbell, bassist Rick Savage, and drummer Rick Allen — are far removed from their Eighties heyday, when videos for songs like "Photograph," "Rock of Ages" and "Pour Some Sugar on Me" ruled MTV, and albums like 1983's Pyromania and 1987's Hysteria moved ridiculous numbers of units (they're currently at 10 and 12 times platinum, respectively — and that's just in the U.S.), they're still able to whip up some first-rate melodic pop-metal. Def Leppard tracks like "Let's Go" (the first single, premiering here), "All Time High" and "Broke 'n' Brokenhearted" exude the band's classic mix of Seventies pomp-glam riffing, Eighties electro-shock rhythms and patented, tremendously stacked chorus vocal harmonies in a manner that's strikingly redolent of their past. 
Def Leppard is a rock band from the 80s. They're one of the earliest glam bands to be formed. They were formed in 1977. They still perform today.