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According to CNET, the move would include both music added to iTunes going forward as well as tracks already on the service, from labels Sony BMG, Warner Music, Universal, and EMI (who already has DRM-free tracks on iTunes). While DRM has long been a hot button issue, one has to wonder if the trade-off of higher prices will be worth it to the majority of users.
iTunes, which publishes a list of its 100 most popular tracks at any given time, is dominated by popular, current music. Naturally, that means raising the prices on these tracks will be immediately obvious to tons of users, who might not necessarily think (or even understand the benefits of) DRM-free music is worth paying additional fees for.