Daring Fireball: The Amazon MP3 Store →
https://marco.org/2007/09/25/daring-fireball-the-amazon-mp3-store
Given the Amazon MP3 Store’s audio quality, prices, and user experience, I can’t see why anyone would buy DRM-restricted music from iTunes that’s available from Amazon.
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The Amazon MP3 Store is clearly the biggest and best rival to the iTunes Store. It’s not a coincidence that they’ve eschewed DRM completely.