well first of all i don't think usher is rap
but if you're asking hip hop/r&b, i'd have to say jagged edge, ashanti, mya, aaliyah, lots more ( i love r&b).. as far as rap goes, i like ludacris, ja rule, dre, snoop, and there's a lot of Christian rappers out there i like (but ya'll probably have never heard of them, so i won't even mention them)