YouTube has decided to block mainstream music videos from the major music companies, and many independent labels, after failing to reach a new licensing agreement with the Performing Rights Society (PRS).
From 6pm tonight, March 9th, thousands of popular music videos will no longer be available to view on YouTube in the UK.
YouTube, which is owned by Google, is thought to want to pay considerably less than it currently does for the copyright to publish the videos.
Steve Porter, head of the PRS, said he was "outraged, shocked and disappointed" by YouTube's decision.
Patrick Walker, YouTube's director of video partnerships, told the BBC that the move was "regrettable".
More after the break
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