song playlist musician 5.0 CCK audio audio.module paypal subscription

I'm a musician and I'd like to pursue a couple of different potential business models for my web site, subscription and pay-per-track:

For songs I'd like the following:

• All songs must have a preview accessible to all, which is a shortened clip from the full track... doing this automatically would be nice but I'd be fine with making the clips myself.
• The ability to purchase the song for $1 via PayPal (or some other system)

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