I haven't bought a Zune yet, and am trying to figure some things out.I have a lot of music, and don't really want to have pay for a zune pass. If I buy a Zune, can I put all of the music I already have on it without paying for a subscription or anything? If I don't pay for a zune pass, what am I missing out on the zune to zune sharing or anything besides the free music?