The Legend of it is that King George the II stood at it's first performance (a benefit for an orphanage in Dublin). Some say he was sleeping and woke up with the load opening of the piece. Others say he just stood out of reverence. Some say he thought it was over. Anyway, when the King stood, so did everyone else. There is some discussion on whether this is REALLY what happened, but the fact is, no one really knows when it started, and it seems to have been practiced for a LONG time. SO...
King George II of england!
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What Mass written by Palestrina, is creditted with saving polyphonic music from being banned in the church via the Council of Trent?