You go out there and put yourself on the line and you make sure you're as good as you can possibly be. You don't (expletive deleted) about, and you don't rest on your laurels. You just give the best show you can — even if you feel terrible, you've got a cold, your back's aching and all that crap. You do it because you are putting yourself on the line and those people have paid good money to see you, and you better be bloody good.
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Good article with Mick and Keith - from an interview with Matt Lauer (!) at
http://www.msnbc.msn.com/id/7815011/