For a flat monthly fee, you can download and listen to as many songs as you want, as often as you want (try it now for free for 14 days). The songs are yours to play, on your Zune and on up to three computers and three Zune players, for as long as your Zune Pass is valid.
You can get a Zune Pass that's good for either one or three months at a time. If you choose a three-month billing cycle, you'll still receive 10 song credits on a monthly—not trimonthly—basis.
Get a Zune Pass subscription
Download music with a Zune Pass
Songs you get with a Zune Pass can be copied to up to three computers and three Zune players, but they can't be burned to CD. If you want to do that, buy those songs using Microsoft Points or song credits.