Of the dozens of riders we perused for this feature, only this one included this demand: "Three oxygen tanks with three masks". We know that the boys in Australia's most famous musical export are getting a little long in the tooth but oxygen equipment? As the rider is perused further we may have found the reason for them, above and beyond age: "Five large (glass) ashtrays". Hells bells, do you think that maybe it's time to give up smoking guys? The requirement for oxygen tanks and masks might be a clue, especially considering that three fifths of your number are basically stationary for the entire show. Brian Johnson and Angus Young expend considerable energy in performance but the rest of you lot shouldn't need oxygen masks no matter how much, or what you're smoking. Another interesting note is that while the boys salute those about to rock they don't do it with booze, leaving the beer out of the dressing rooms until after the performance is over.