The first concert I went to was to see public enemy, run dmc and *cough* derek b, when I was 13. It was immensely good, Public Enemy then (it must have been 1987) were thunderous. They were angry, but their anger was channelled into wit and intelligence, in their lyrics, rather than mindless hate.
Last year I saw them in Rio, and they were still a great rap outfit, but they've lost some of their gravitas.
Terminator X to the edge of panic!