went to Rebellion last year, the sound in the main venue was awful for the first couple of days, sounded like they'd put reverb on the bass drum, just a sea of mud, my mate went up to the desk and actually told them the sound was rubbish, they just pointed at the high ceiling and said there's nothing they could do, come day 3 the sound in the venue was spot on, I just thought "Christ, people are paying £180 a ticket here and they can't even get a sound man who knows what he's doing"