Amazon is currently winning over Apple.

Amazon
Collections from
Warner Music Group ( Led Zeppelin, Red Hot Chilli Peppers, Green Day)
EMI
Universal
and 33,000 independent labels

The total catalog is of about 2.9 million songs. Amazon lets tracks to be priced variably

Apple iTunes
DRM-free music only from EMI. Catalog is of about 6 million tracks and they are priced at fixed rate (99 cents a track).

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