allofmp3.com is a Russian site. In all likelihood, it is rather illegal. For example, they have a nice Beatles collection despite the fact that Paul, Ringo, the estates of George and John, and Apple Records have not licensed any Beatles songs to be sold online. Legality aside, absoutely none of the money goes to the artists or their labels. You might as well use a filesharing system (I’m not advocating this; buy the CD already!) and you save money and the artists come out exactly the same. The only reason to use allofmp3 is to make yourself feel better that you paid someone for your music so that it’s somehow “legitimate.”
You could use my unorthodox method of buying CDs at a local music store by artists you’ve never heard of simply because you like their cover art. It’s worked well for me, but YMMV of course.