Music MP3 is the partner site of another music site I've reviewed, Golden MP3. However, it seems that this site has been closed and no longer used. It has had the same error message on it for months now:
"While MusicMP3.ru is experiencing some technical problems with accepting credit card payments you might sign up here, on its partner-site GoldenMp3.ru with equally broad and diverse music collection, and replenish your account balance."
I would be cautious about both Music MP3 and Golden MP3 your credit card number and personal details, even if they do fix the problems. Both sites could do a lot better.
Other sites offer a better service, songs for a cheaper price and better bonuses and offers.
Please visit our Comparison Table for a list of alternative sites to buy your music from.