Joseph Thomas Elliott, Jr. is an English singer-songwriter and musician, best known as the lead singer of the English rock band Def Leppard. He has also been the lead singer of the David Bowie tribute band the Cybernauts and the Mott the Hoople cover band Down 'n' Outz. He is one of the two original members of Def Leppard and one of the three to perform on every Def Leppard album.