From Atomic Mass to Def Leppard (1976–1979)
The group began as Sheffield schoolmates in a band called Atomic Mass in 1976. Joe Elliott joined as lead singer in 1977, the name evolved into Def Leppard, and an early EP attracted BBC Radio 1 attention. By the end of the decade they had signed to Phonogram/Vertigo and were positioned among the new wave of British heavy metal. [1]