I just came across this today while looking for John Cage records on
Amazon:

www.catm.co.uk

Some professional musicians are getting fed up with the amateurs on X-
Factor getting the Christmas No.1, so they've put out a recording of
John Cage's 4'33", this is a piece composed in 1952 which is for any
number of musicians to remain silent for 4 minutes and 33 seconds.

Only seems to be available as a download, it would be more effective
as a CD or even better on vinyl (you would get the crackle etc).