Wow. Was the House of Blues booked that night? John Mayer played a surprise "blues set" at the Viper Room. "This is a blues jam and that means there's no structure." What? I guess this is something they teach at Berklee, either in Blues for the Suburbs 101 or Stealing Black Music 243. Bruce Willis must be kicking himself that he was in D.C. last night, staring creepily at inner city kids, and couldn't jump onstage to blow some harp, baby. This reminds me of an article I read about John Mayer where, I swear to God, he said something along the lines of "Kids should be into the blues more. Like Bonnie Raitt."