Filed under: iTunesA new NPD Group survey says that if Apple ever does release its rumored cloud music service for iTunes, there will definitely be an audience. Over 25% of iTunes users polled say that they would be interested a free iTunes cloud service. And about half of those would be interested in actually paying $10 a month for services like music sharing and streaming their personal libraries through iTunes. Out of an estimated 50 million users in the US, NPD says that 15 million or so would be
