I wonder what song could she participate in.
But at every one of these NY shows the rumor has been that Bruce Springsteen will join and even that which is lots more likely hasn't happened.
So I would take that rumor too seriously
I do hope for The Crystal Ballroom / Miss You tonight to appear though, it was a great medley
nobody wants to see gaga on stage, unless she and the band totally go for it....have her in the cage and use the screens for Dublin while band plays Running to Stand Still - And so she woke up.... - like some kind of performance art - I see seven towers but I only see one way out...- other than that the band better begin adding songs if they are going to ruin the already established songs from the set by bringing up guests.