A hilariously appropriate incident of this was just brought to my attention via the always awesome reddit:
This is a “recording” of John Cage’s 4’33″. If you try to play this video you will see that:
NOTICE: This video contains an audio track that has not been authorized by WMG. The audio has been disabled.
Hah! The joke’s on you, Warner Music Group!
Of course, this wasn’t the first time that 4’33″ has been the subject of copyright dispute. You can read about how Mike Batt was sued for infringing on the same copyright here.