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Excellent post in Musicians
http://www.drownedinsound.com/community/boards/musicians/4184777
"We are currently casting a major international live event/show
to take place in London.
Due to the high profile of this job we cannot at this stage mention what this event/show is."
No, obviously, and you wouldn't want to let anything slip that might affect potential applicants' reaction.
"Overall the Talent must be free between July 09-March 2010."
Jacko, then.