Did he hit any high notes? I doubt that he could sing demanding, high-register songs like "Black Dog" or "Rock And Roll" in concert these days. He could barely get through them in the 1970s on "The Song Remains The Same" live album.

It's because Robert Plant can't sing those songs anymore at the age he's at. Jimmy Page and John Paul Jones can still play, but the effects of time on Plant's voice have sadly taken their toll. A lot of their biggest hits are sung in a pretty high register; Black Dog, Heartbreaker, Immigrant Song, Communication…