NEW YORK For nearly three decades, hip-hop relics such as vinyl records, turntables, microphones and boom boxes have collected dust in boxes and attics. On Tuesday, owners of such items _ including pioneering hip-hop artists such as Afrika Bambaataa, DJ Kool Herc, Grandmaster Flash and Fab 5 Freddy _ will blow that dust off and carry them to a Manhattan hotel to turn them over to National Museum of American History officials. The museum, part of the Smithsonian Institution in Washington, D.C., is announcing its plans to embark on a collecting initiative, "Hip-Hop Won't Stop: the Beat, the Rhymes, the...