Ice-T plays a cop on TV these days, but two decades ago he was a pioneering gangsta rapper that stirred up all kinds of trouble with his 1992 song "Cop Killer." That's what got him mainstream attention, but before that hip-hop fans knew him from the movie Breakin' and his long run of classic singles. "Colors," from the soundtrack to the 1988 Sean Penn movie, was his first in the Billboard Hot 100. VH1 labelled it the 19th greatest hip-hop song of all time. But there's no such thing as Classic Hip Hop radio, and lots of these songs fade into memory when the fall off the charts.