Sky Songs is Sky's new subscription music streaming and download service. As a Beta Bonus, it is offering one month free, and one £6.49 album free, exclusively to Sky Broadband customers.
You do have to provide card details (or your SkyID details), but by selecting "One Month only," you should avoid being sucked into the service - removing the onus on you to cancel before the end of the first month.
The best part is that the downloaded mp3s are DRM free, so you can use them with whatever device you want.
LINKY for you to consider.