iTunes Match has officially launched with the recent release of iTunes 10.5.1, available as an update or via software download from Apple.
iTunes Match, which costs $24.99 per year to receive cloud-based matching, intended to launch by mid-October. In the last couple of days, developers tested iTunes 10.5.1 in preparation.
iTunes Match stores your music in the cloud -- up to 25K songs -- and lets you access it from your iPhone, iPad, iPod, computer or Apple TV.
Earlier today, we found leaked screen shots of Google's Music Store, which charges anywhere from $0.99 to $1.29 for songs. Other similar services include Spotify -- $9.99/month -- and Amazon's Cloud Drive, which costs $20 per year without storage limits.
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When you first subscribe, iTunes Match gathers information about your iTunes library, matches it with songs in the iTunes Store and then uploads artwork.