Streaming services soar in the first half of 2015, with former holdout Taylor Swift leading sales.

If there's any question whether streaming has truly arrived, the Nielsen Music midyear numbers should put it to rest.

In the first half of 2015, streaming nearly doubled in popularity, growing to 135.2 billion streams from 70.3 billion in the same period of 2014, according to Nielsen Music. Within 2015's number, audio streams climbed 74 percent to 58.6 billion, while video streams featuring music rose a whopping 109 percent to 76.6 billion.

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