    Sentence 1: When did ABC announce the restructure of  ABC radio?    Sentence 2: Between May and September 2005, rumors  circulated that Disney-ABC was considering a sale of  ABC Radio@®vith*Clear Channel Communications and  Westwood One (which had earlier purchased NBC's radio  division, as well as the distribution rights to CBS's, and  the Mutual Broadcasting System dur 1990s) as  potential buyers    