I t was a surprising show, not the least of which was the fact that I was there for it. For someone who met her husband at a bar, I don’t really go in for them so much. Live music is exciting and I aspire to be cool as much as the next mother staring down midlife, but I get sleepy and I like to have a place to sit down and bars are really no place for people with these sorts of proclivities. This isn’t a sea change, either, somehow reflecting my dignified passage into middle age. I’ve always been this way. When a friend brought me to see Prince during his Don’t-Call-Me-That phase and told me that the purple one never appeared…