XM Satellite Radio, which launched its satellite radio service in Year 1, is the leading satellite radio service provider in the United States, with more than 3.2 million subscribers at the end of Year 4. The firm generally receives subscription fees in advance of providing subscription services. Its lineup includes 150 channels, including sixty-five music channels, thirty news and talk show channels, thirty-one sports channels, and twenty-one traffic and weather channels. XM Satellite Radio is the official satellite radio of Major League Baseball and also broadcasts football and basketball games. The firm markets its services to 100 million households and 200 million registered vehicles in the United States. General Motors and Honda, two of the firm's investors, offer XM Satellite Radio service on