A post in a Forum mentioned that BaiDu.com employ different visiting policies to users from China and the U.S.
The essay said that if one visit http://mp3.baidu.com from America, he/she would not get the opportunity to download songs that this "Biggest Chinese Search Engine" have grasped from the Internet. I am not in America so can not testify if it is true.
If it is. I feel sorry to see it since Baidu may be doing evils. Up to 16% of hits to BaiDu.com, according to the essay, are for musics. The legality of this service was questioned in some cases before, but after BaiDu added some statement in each downloading windows, its counsels thought it is safe to keep on providing MP3 downloading.