Apple and Pandora have topped a new survey of digital platforms, with Apple's iTunes remaining the dominant player in the paid for music download service sector, with a 64 percent share of the market in the second quarter of 2012. Amazon's MP3 Store comes a distant second with 16 percent, and no other purveyor of paid downloads exceeds 5 percent. Google Play, eMusic, Zune Music Pass and all of the others combined only account for 20 percent. The NPD survey also said that 50 percent of US internet users were aware of Pandora’s free ad-supported radio service, and a third of them also knew that Pandora offered a paid subscription service. Clear Channel’s iHeartRadio had 25 percent consumer awareness, followed by Spotify with 19 percent.