Bill Gates' Green Light Music service kicks off for pros

Microsoft Corp co-founder Bill Gates' privately held Corbis, which provides photos and film video for advertisers, is expanding further into entertainment by launching an online music service with songs from the four largest publishers. The GreenLight Music service went live on Wednesday, with more than 1 million tracks from catalogs controlled by Warner Music, EMI Music Publishing, Universal Music and Sony ATV. Corbis , which the Microsoft chairman started in 1989 by securing the digital rights to such art masterpieces as the "Mona Lisa" and "Whistler's Mother", created GreenLight in 2008 and used it to jumpstart efforts to transform itself .

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