Music videos continue as key online content with YouTube said to be investing cash in Vevo.

Vevo ranked as the third most-watched video site in the U.S. last May, with 49.5 million viewers per month according to ComScore . No. 1 was Google, with 157.7 million viewers (YouTube), and second was Yahoo. YouTube helped create Vevo’s back end, and Vevo’s videos are best known for appearing on YouTube.

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