Robert Plant: Brendan Byrne Arena, East Rutherford NJ

YOU HAVE to feel a little sorry for Robert Plant. Since the breakup of Led Zeppelin, the singer has put together a successful solo career on the strength of several unpretentious, highly musical albums and, while becoming one of rock's elder statesmen, has been an ardent advocate of newer bands like the Cure and R.E.M. But his audience hasn't kept up with his tastes: at New Jersey's Byrne Arena it was Robert Plant, Rock Legend — not Robert Plant, Flourishing Recording Artist — the audience came to hear.