|  iTunes Apple's iTunes music service has strengthened its lead in the US music market , growing to a whopping 26.7% of all music sold in the States, up from 21% a few years ago and 12% in 2007. That's pretty phenomenal growth, buoyed almost certainly by the rising share of digital music versus brick and mortar stores. Digital purchases make up 35.5% of music bought here, also up from 31% the last time Billboard released stats. So where are all of these music purchases coming from?
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