qtrax-press_pic04.gifThe world’s biggest music companies, including Warner Music Group Corp and Sony BMG, denied that they have agreed to license songs for a free download service that was launched by Qtrax on Monday. Qtrax told Reuters and other media outlets last week that it had deals with the major labels representing about 75 percent of all music sales, to let users download songs for free in a new service to be supported by advertising revenue.