Just days after enabling in-app subscription purchase, Beats Music is the #1 free music app download on iTunes. Among free apps in all categories, Beats Music ranks #5. The shift costs Beats 30% of very $9.99 monthly subscription, but is likely driving conversions from free trail to paid. Rounding out the top music apps on iTunes is Pandora, Spotify and Soundcloud. Beats Music updated its iTunes app on Friday, adding in-app subscriptions along with more control for artists. The move means Beats Music now pays 30% of any $9.99 monthly subscription fees generated via their app to Apple. Rhapsody and...

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