Gangsta's ParadiseAmazon. com Old school hip hop, which builds its sing song raps atop samples of old funk and soul singles, may be on the way out, but in its twilight days it has yielded one more brilliant album, Coolio's Gangsta's Paradise. Coolio, the Compton rapper once known as Artis Ivey, creates tape loops of the catchiest sections from old songs by Smokey Robinson, the Isley Brothers, Billy Paul, and Herbie Hancock, and then raps his ghetto slice of life