Not internet radio stations, but digital over-the-airwaves radio.

RIAA Moves In on Digital Radio

Interesting snippets:
Without copy protections, music fans could cherry-pick songs off the air and redistribute them over the Internet, further deepening the copyright woes of record labels, the Recording Industry Association of America said.
and
XM Satellite Radio Holdings and Sirius Satellite Radio, which broadcast digital signals by satellite, do not pose the same risk because those companies would be hurt by song copying and thus have an incentive to limit it, RIAA officials said.
I'm going to interpret that last piece as "Sirius and XM are already in our pocket, paying our extorted fees, so we don't care about them."
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Bitt Faulk