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Jagger.
Springsteen.
Bono.
Tyler.
Prince.
Plant.
Freddie.
Rod Stewart.
Hutchance.
Paul Rodgers.
Tom Petty.
Todd Rundgren.

Probably dear old Freddie was the best front man ever. As well as most of the excellent suggestions, I'd add Peter Gabriel into the mix.

I'm surprised Dave Gahan hasn't been given a mention in here. Anybody who has seen Depeche Mode live, will know Mr. G gives it his all.