Music subscription services that work on the Mac?

[Larry Wanger]

I'm familiar with music subscription services such as Napster, Rapsity  
and others but don't believe the subscription part of these services  
can run on the Mac. Is this correct or does someone know of a service  
that will. For those who aren't sure what I'm speaking of, several  
services exist where you pay a flat rate and, as long as you pay that  
fee each month, your music works just fine. Anyone have some  
suggestions?