LOS ANGELES (Reuters) - Online music broadcasters and the record industry's main trade group, heading off what promised to be a contentious battle between them, on Thursday proposed a new set of royalties for Internet music broadcasts. The resolution, which covers 2003 and 2004, came after a long and bitter dispute that involved lawsuits and arbitration over the royalty structure for past years. The Digital Media Association and the Recording Industry Association of America said they filed the proposal with the U.S. Copyright Office, which will soon publish it for public comment. The RIAA and the Webcasting industry...