According to CBS 2,
"A man who said he was cleaning out an old videotape collection found what he thought was a recording of R&B singer R. Kelly in concert, but instead turned out to show a man who appeared to be Kelly sexually abusing girls, he and his attorney said Sunday."
The PA man named Dennis delivered the tape to law enforcement who wont further discuss the contents of the tape -- however, they do say that what's on it is an incident outside of the 10 counts of aggravated assault that Kelly faces in Chicago.
He thinks the tape was given to him by a friend because it also had a sports game on it. However, Dennis says he has never met the singer, and is totally unsure how this tape ended up in his house...