Actually satellite radio is treated differently than terrestrial radio; they're required to actually pay performance royalties. The
Washington Post estimated that Sirius pays 1.6 cents per listener per hour, while Internet radio such as Pandora would be forced to pay a higher rate of 2.91 cents per listener per hour (Pandora has since had that rate lowered, though they say it's still higher than Sirius's rate). Those numbers are actually quite close to what Spotify pays. If we assume that $0.0016 per stream average, and go with 4 minute songs, that's 2.4 cents per listener per hour.