Hey, well this is the first PS3 I've ever had (bought it today) and I'm getting used to it atm. But I installed Music Unlimited, for the 180 day free trial. Had a browse, and found plenty of tracks I liked. What do I do to purchase/and/or download these. So they appear in my music section on the PS3.

Might seem a silly question but still getting used to it, help appreciated :)