"You must be the most attentive audience, ever" joked Chris Thile, during his performance at LA's gem Largo at the Coronet, "It's not often that you can hear the performer's water bottle snap back into place." And it was true -- in this intimate setting of about 75 people (including fan Minnie Driver), Mr. Thile was the center of everyone's attention. There was no heckling or chatter between songs, just enthusiastic, almost rapturous applause for this mandolin virtuoso.