New research claims Apple’s revenue generated from its music business should hit US$6 billion by 2007, reports Macworld UK. In fact, independent analysis from Generator indicates that Apple could double in size in two years as a result of its foray into digital music. “Apple will need to introduce many new products to maintain momentum. If they can, our analysis shows that music alone could double company revenues within a few years,” said Andrew Sheehy, director of research at Generator. The forecast also anticipates music-related revenues of $9 billion by 2013.