Apple vs. RealNetworks: Round 3 or 4 or something like that

You just knew that the catfight between Apple and RealNetworks over online music downloads was going to continue. Apple is disputing Real's claims from yesterday that Apple's share of the market dropped from 70% to 60% during Real's recent half-price music sale (where they managed to sell about three million songs and supposedly double their marketshare from 10% to 20%), saying that iTunes Music Store sales actually increased during that same time period and that they didn't see any sort of drop in marketshare at all.