The FCC yesterday okayed WGBH’s purchase of classical WCRB 99.5 FM from from Nassau Broadcasting Partners, the Boston Globe reports today. WGBH revealed in September it was bidding to buy the Waltham, Mass., station so it could convert 89.7 FM, with a mix of NPR programs, classical, and jazz shows, to an all-news talk format. Classical music will shift to 99.5 FM. The purchase puts WGBH-FM in direct competition with Boston NPR News powerhouse WBUR.