I'm new to this board, so forgive me if this question has been asked before. But I'm wondering why classic TV from the '50s & '60s still programs on TV today (sometimes on local stations), but Top 40 music from the '50s & early '60s (Oldies) has disappeared from radio in most markets around the country. Or to put it another way, why can TV sell advertising to a 55+ audience yet radio tells us that it can't?