YouTube muting videos with copyrighted music

So it seems that I jumped the gun a bit when I said that the music industry finally ‘gets’ how the digital world works in my DRM post last week. It seems that copyright holders are demanding that Google mutes any video which contains copyrighted music on it.
Some videos which have had the silent treatment include this, this and this.
Users are greeted with a video that has the volume control disabled and a message underneeth the video saying this:

This video contains an audio track that has not been authorised by all copyright holders. The audio has been disabled. More about copyright

Will the music industry ever learn? You may remember the internet phenomenom Rickrolling whereby people would jokingly link to the Rick Astley song ‘Never Gonna Give you Up’, claiming that it was a link relevant to the topic at hand. Not only did the song get viewed 14 million times on YouTube but it hit the mainstream media with the song appearing on shows like Family Guy and getting radio play. As a result, sales of the song rocketed on iTunes, Rick Astley enjoyed a comeback of sorts and he even got nominated for ‘Best Act Ever’ at the MTV Europe Music Awards.

But of course exposure on YouTube only damages music sales, right? :/