Sirius Satellite Radio, the satellite radio broadcaster, began Thursday, Feb. 14, the first phase of its national service rollout in four metropolitan markets: Denver, Houston, Phoenix, and Jackson, MI. To commemorate the start of its satellite radio service, Sirius broadcast inaugural programming and treated Jackson to a special live concert featuring Randy Travis and a host of country artists. Sirius is in competition with already U.S. nationwide XM satellite radio. XM channels originate from XM’s broadcast center in Washington and are transmitted across the U.S. via two satellites. It is commercial-free and users pay a monthly subscription fee. It was launched in September 2001.