It sounds a lot like bookmooch.com, where members swap books. I've received a few that way, and have sent a few as well.
Membership is free and there are no charges at all. However, members pay the book's shipping fees. You can elect to send books only locally or internationally as well.

I can see the up- and downsides with regard to music, however.
On the positive side, it could lead to someone actually purchasing the CD or other CDs by the same artist if they were happy with the CD they'd got by way of a swap.

For instance, last week I wanted book 2 in a particular series that I love. There are seven books in the series and I already had # 1 and # 3. A bookmooch member in Sweden had a copy of # 2, but none of the others were present on the site. So I simply ordered all the rest (secondhand) from Amazon.

Something similar could happen with music. Say someone can't get a particular CD by swapping, she/he might be motivated enough to actually go out and buy it. Or by the same token, she/he could spread the word about how good the CD is, and other people will go out and buy it... ;-)

(I note though that SWAP A CD has a charge of 49 cents per swap. Presumably this goes to the website owner. Maybe a case could be made for the artist to get a least a part of that.)

Donna

Honour the Earth. Without it, we'd be nowhere.

Life is too important to take seriously.