Checked the amplified.com website. It did not accept the username I used for the Aveeno offer. Their "About Us" page says that they offer music downloads to third-party companies to use as incentives or free rewards. So, if anyone got upset, it would be Aveeno. I doubt they would get too upset since they are getting so many hits on their site as a result.
Anyway, the amplified.com website does offer downloads through their site, too. I signed up (different username and password) and downloaded from them. ($ .99 each). Their downloads were much easier than the ones I've gotten from Walmart.com.
So, if you are going to download a bunch of freebies through this offer, at least consider them for your future downloads after this offer is done.