Apple's place atop the music retail food chain gives it an incredible amount of influence. So it's no surprise that iTunes has 13 entries in this year's Maximum Exposure survey. The store had a 41% share of the U.S. record business in 2012, according to Billboard's calculations, and it has a 63% share of digital sales, according to NPD Group. The relatively limited number of ways to reach fans through iTunes makes them highly coveted in the industry.

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