Tony hopped onstage to duet with Billy on his classic, “New York State of Mind” — which would’ve been an awesome enough toast — considering both guys are born and bred New Yorkers.
But then the entire crowd serenaded Tony and Billy even brought a cake for his pal — he was off by a few candles though.
Some Billy fans thought he had another surprise guest … AC/DC … when he busted out “Highway to Hell” — but it was just Billy’s roadie, Chainsaw, doing a cover. Too bad, so sad.
Chainsaw rocks though.