i dont know about the other programs, but when i used to work at an isp, we would get messages from sony all the time saying that "so and so is hosting a song that is copyrighted" every instance that i saw, the program used was aimster. in most cases, we would shut down the customer's line right then until they got rid of the music.
just to let you know, i think aimster is monitored more by the recording companies.