Def Leppard is an English rock band formed in 1977 in Sheffield, England. The group consists of Joe Elliott (vocals), Rick Savage (bass), Rick Allen (drums), Phil Collen (guitar) and Vivian Campbell (guitar). They are one of the world's best-selling music artists, having sold over 100 million records worldwide. Def Leppard is known for their hard rock sound and their hit singles such as 'Pour Some Sugar on Me', 'PHOTOGRAPH' and 'Love Bites'.