Forgotten Rock and Roll Frontmen

How many of these virtually unknown rock and roll frontmen do you recognize? Or even know about? There may be a few, like Ex-Buggles frontman Trevor Horn, who replaced Jon Anderson in Yes right after Anderson left the group, then Horn only lasted for one album...or Steve Augeri, who sang for Journey right after Steve Perry left, but had such vocal problems, he had to leave too, then it was Jeff Scott Soto, then Arnel Pineda....oh, and Steve Perry had a precursor who sang for the band: Robert Fleischman (who?) How about Chris Dennis as an early Pink Floyd singer, Johnny Edwards or Chas West as replacements for Lou Gramm of Foreigner, and about a million guys who stepped in when Ozzy couldn't do it for Black Sabbath....more about these and a ton more guys (and one lady) you may have forgotten about, here.