Rick Allen has been the drummer for Def Leppard all their
career.
Actually, Tony Kenning was the original drummer for Def Leppard.
Then Frank Noon was the drummer for just a few days. Rick Allen
then became the permanent drummer for the band.
Rick Allen, the drummer for the rock band Def Leppard, has five children. His children's names are Lauren Shane Allen, Griffin Allen, Lilly Allen, Scarlett Allen, and Jenna Allen.
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1977 is the date when "Def Leopard" were formed.
Whether or not Rick Allen their drummer from the beginning or
not, I don't know.