Will TV host's endorsement give e-books the push they need?
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XM posts a 57 percent gain in revenue, beating expectations.
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Sirius Satellite Radio, with the shock jock, gets a jolt in subscriber numbers.
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But, while XM warns of market ‘softness,’ it also narrows its projected loss.
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Rivals XM and Sirius post growing losses, but the battle for brand-name talent continues.
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In the face of declining CD sales and continued disagreement with Apple, Warner Music shows major digital gains.
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