I went to the Black Keys last night in Detroit. Last time I saw them (about 5 years ago maybe) was at a little theatre in front of maybe 75 people. They already had a decent following at the time and I was sort of amazed there were so few people at that show. I later came to find out that the show was being sponsored by some cigarette company and tickets were only available through them (and a few other local sponsors) so a lot of people who wanted tickets probably didn't know where to get them. All in all though, I'm not complaining about the small crowd.
This time around though was in an arena with about 15,000 folks. I was a bit apprehensive that their sound wouldn't translate well into such a large venue... but no worries. They were absolutely spectacular again. I will say that the songs they played with just Auerbach and Carney were much better than the songs they did with a full band.