Apple no longer has the field to itself - Amazon is expanding rapidly:

In perhaps the biggest threat to Apple's global dominance of digital music, Amazon just announced the international rollout of Amazon MP3. Right, the on-line storefront offering DRM-free music from all four major labels. That's 3.3 million songs (priced at $0.99 or less) from over 270k artists encoded in 256kbps MP3 files for playback on any PC, any Mac, and pretty much any portable device you might own.

Things are looking really good for consumers of music right now - a big change from the last few years.

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