The digital music industry is set to double from $7.4 billion to $20.1 billion in 2015, according to a new study. That’s a compound annual growth rate of 22.1% over the period. Subscriptions will be the fastest growing segment, growing at a compound annual rate of 60.8% to 2015.

In terms of digital music market value, the US, Japan, UK, France and Germany are the key digital music markets, together accounting for 79.5% of the global market in 2010.

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