Sure, there are a few folks that subscribe to their music. And Microsoft has signed agreements with EMI Music, Sony BMG Music, Universal Music Group and Warner Music Group in addition to a bunch of independent labels (Techmeme, statement). The deal: You pay $14.99 a month, you keep 10 tracks a month for your permanent collection and Zune customers keep the DRM free music.
Sounds logical although Microsoft's Zune doesn't have the market share to make subscriptions mainstream by itself. I never quite got the "I want to download and own" music mantra. I'd prefer a subscription model since I'm tired of managing a collection. Just get me the rights and let me discover stuff. Then again, I'm only conceptually on the bandwagon since I have an iPod and am not running out to get Napster ToGo, Rhapsody or some other services.
Also see: Matthew Miller: Zune 3.1 firmware gives you 3 new games, price drops for flash Zunes too
Sam Diaz: Can a price cut, TV ad give Zune a lift?