In a bid to try and keep the record labels happy, YouTube have wiped the sound from a bunch of videos. A whole big bunch:
Ouch. This will really hurt. Everyone. The amateur film makers, the artists, Youtube, us - the users. Yes, sure, I know: synchronization [the use of music in a public audio-visual production] is subject to a license by the writer, publisher, label, artist (and another dozen of parties), no matter how small the use. That's the law.
If you didn't know better, you might surmise that Google was almost trying to reduce the popularity of YouTube as a catch-all video service in order to concentrate on the official videos which come with the copyright already sorted and much better chances of flogging lucrative adverts around. If you didn't know better.