Thanks everyone... the incident that started this thread was a SMALL group of 6 or so ageing hippies...singing, one at a time, no amplification, no drums, no instruments at all! a glass or so of whiskey, no-one drunk, no-one rowdy...just a few friends saying farewell at the end of a VERY difficult week spent protecting the property of the festival goers...including that of the complainant!

I think it is reasonable to expect to sleep sometimes ...one of the things I love about festivals is going to sleep to the sound of music or song and waking up to the sound of early morning melodian practice...but if quiet is important for sleep you put your tent in a quiet area...not close to the entrance or any public area.