Grading on the curve of "almost 90 year-old music legends who still tour", it was a solid B+/A-.
Grading on the regular curve... his band was really good: great keyboards, great bass, amazing horns, especially the trumpet player. King can still play, and he can still sing.
The genius is evident. Unfortunately, much of the time it seemed like the genius had wandered into the room and then forgot what it was doing there. He took the stage fairly late, and by the time his people decided it was time for him to call it a night, I'm not sure he had done much more than an hour. Many of the "tracks" were long, meandering versions with the band moving things along the best they could and King knocking out a few key chords or verses here and there along the way. It's a good thing jazz and blues musicians are all about riffing and improv. At least I got to see him do The Thrill is Gone, and that was one of the more coherent/cohesive tracks. Sadly, the title seemed all too apropos.
Hey - I just hope that if I live to be 89 I can remember my own name.
The scene at the end of the show was moving: half of the audience crowded the stage to take pictures of him, because, right or wrong, there was a very palpable sense that he might not have much time left.
The harmonica player for the opening act (a local blues trio, Stoney B Blues - YMMV) was amazing, and the lounge band after the show while I waited for traffic to clear out was actually really good, too.
I understand why they need to do it, but when the venue binds all the seats together with ZipTies, it makes for REALLY close quarters - uncomfortably close. The view was very good. The audio engineer had Lucille turned up WAY too high, and King's crates kept rattling and buzzing - not the good way.
You could get lucky, and you might get B.B. on an "ON" night. If you've seen him, you probably don't want to remember him this way. If you haven't, you probably still don't want to remember him this way.