Do I Look Like A Mind Reader, Sir?

From MTV.com:

Following a year in which numerous DJs mixed Jay-Z's vocals with the music of the Beatles, Metallica, Weezer and others, the Brooklyn, New York, rapper tipped his hat back to rock fans by performing at two unlikely concerts over the weekend.

The stranger of the two was Friday night during a set by the jam band Phish in Coney Island in Brooklyn, at the group's supposedly final New York-area show (see "Phish Bid New York Fond Adieu At Farewell Shows"). After the veteran rockers played "Wilson," the second song of their second set, Jay hopped onstage and the group backed him on "99 Problems" and "Big Pimpin'."

Is this for real?