By ALEX VEIGA LOS ANGELES (AP) -- Music fans continued swapping songs over the Internet, though a bit more cautiously, despite the recording industry's threat this week to sue individuals engaged in digital piracy.The threat appeared to have little effect on the pace of downloading over the most popular file-sharing services.But the move drew the ire of many fans, driving speculation that it could ultimately backfire and encourage a new crop of file-sharing services capable of keeping users anonymous.