More than one of every three Internet users will listen to Internet radio weekly this year, reports EMarketer. That 37.5% of 12+ Internet users in the US means more than 79 million listeners to online radio. That number will continue to grow and hit 157 million and 67% of that population by 2015.

EMarketer also projects that online stations are billing $800 million this year and will grow that number to $1.6 billion by 2015.

Hmmm. While I am liking the sound of these numbers, particularly the revenue, the write up that I read online isn’t sounding so smart to me, as it appears to compare broadcast revenues to online radio revenues in one breath, but then throws the term “pure plays” in. Revenues derived from pure plays would include online stations only and not include broadcasters’ streams. I ‘think’ it’s a mistake, and the $1.6 billion is meant to project revenues for all of Internet radio, not just for pure plays…