San Francisco - A number of top music managers say that their artists have not seen any revenue from deals made by their labels to offer their music videos on Google's (NASD: GOOG) YouTube video site, CNET News.com reported. "I don't know any artist who has gotten a royalty statement (from their label that includes YouTube money)," music attorney Chris Castle told News.com.

Meanwhile, many of the all-time most-watched videos on YouTube are music videos, including one with over 75 million views.

Some of these managers told News.com they fear YouTube's tracking system cannot accurately account for when artists' videos are viewed for reporting to the labels, but say they are encouraged by YouTube's steps to improve its reporting.

YouTube uses audio identification technology from Audible Magic to both block copyrighted content, and track its authorized usage on the site.

The music managers also pointed the finger at the labels themselves, which have not disclosed terms of their respective deals with YouTube, or how they divvy up their artists' shares of any ad revenues.

"Warner Music Group (NYSE: WMG) shares all of the digital revenue we receive with our artists in accordance with the terms of their agreements," the company said told News.com, while the other three major labels declined to comment for the story.

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