Ludacris joins the Headphone Race with Signeo USA

By The Hip Hop WriterHip Hop Vibe Staff WriterTwo years ago, Dr. Dre started a trend when he launched his headphone line, "Beats by Dre." The famed producer enjoyed one year of being unique. Soon, he was followed by Diddy and Jay-Z. It was not even a week ago when 50 Cent joined the headphone business with his new line.For years, the top hip hop businessmen have been Diddy and Jay-Z and 50 Cent