Classical station has new business model: support of donors Boston is following a trend in radio that’s taking place in other cities across the nation: Its only 24-hour classical music station now depends on listeners - not advertisers - to keep it afloat. Last week’s Federal Communications Commission approval of WGBH’s $14 million purchase of WCRB-FM (99.5) means the classical musical station is now a public broadcaster, with a business model that draws revenue from donations and corporate sponsorship instead of relying on advertising. Because classical music fans tend to be older, and advertisers typically want to court a younger...