Guest stars like Chaka Khan and Stevie Wonder are on hand to help the 87-year-old vibes king woo younger fans. But the For the Love of Music's producers would have been better off letting Lionel Hampton do his own thing. The one track overflowing with the boundless joy Hamp is famous for is ''Mojazz'' (in honor of his new record label), in which he's joined by pianist Junior Mance and saxophonist Jerry Weldon. B

