Jason Keyser is a godlike vocalist to be sure, but he actually didn't sing on Entity. I think he couldn't make the studio dates in time or something. He is an outstanding frontman though, his performance last year at the free Scion show at the Roxy was utterly ridiculous. I have never seen a death metal singer command a crowd so easily.
The Sword - 12/12
Corrosion of Conformity - 12/18
High on Fire - 12/22