Amazon's digital sales grew 29% in Q1 2012 compared to Q4 2011. iTunes sales were relatively flat with only 2% growth over the same period, according to eDataSource. Digital sales at Amazon are comprised of kindle content, mp3's, streaming videos and android apps. Music is estimated to account for 12% of Amazon's total digital sales.
iTunes sales include music, video, digital print and apps from the Apple App store.
"iTunes was a key driver in hardware and overall sales for Apple. They built a great lead and a very sophisticated ecosystem where it is easy to buy," said Carter Nicholas, CEO of eDataSource. "That shows in terms of the magnitude in total sales for iTunes and the amount spent per person. Amazon and others are behind but showing growth as their ecosystems become more robust and complete. 29% growth from the previous quarter is an impressive number."