Jive's Unreleased Masters for the Children's Health Fund Vol. 1

Jive's Unreleased Masters for the Children's Health Fund Vol. 1, benefiting health-care programs for inner-city kids, is a primo mixed tape of the best material — much of it unreleased — from R&B and rap's top shelf (KRS-One, A Tribe Called Quest). R. Kelly uses his contribution to redefine himself musically: His ''Gotham City'' remix trades his slick pop soul for bluesy ghetto grit, replete with Curtis Mayfield-style wah-wah guitars. He should take such chances on his own albums. B