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AT&T; Corp.’s Liberty Media Group cable TV programming company agreed to buy Ascent Entertainment Group Inc. for about $510 million in stock. Liberty Media will exchange 0.4626 Class A share, or $17.15, for each Ascent share. The deal represents a 36% premium to Ascent’s Wednesday closing price. On Thursday, the stock closed at $16.06, up $3.44, on Nasdaq. Ascent, based in Denver, offers pay-per-view entertainment and Internet access to hotels. The sale excludes the sports teams and Denver’s Pepsi Center, which billionaire Donald Sturm is buying from Ascent. Liberty Media Class A shares fell 25 cents to close at $37.06 on the NYSE.