Leonidas Kavakos is a marvel of exactitude. There's a Leonardo da Vinci-like quality to his playing, as if you could plot mathematically how every micro move accounts for his elegance and efficiency. In this extraordinary violinist, artist and master technician coexist in polished communion.
If a listener Tuesday night had to strain a bit to hear that which is human, it was understandable. In his Philadelphia Chamber Music Society recital at the Kimmel Center of four Beethoven sonatas, Kavakos was sometimes a cool customer. He is fully capable of being expressive, and he was, in measured ways. But anyone hoping for the full range of drama one can hear in the playing of, say, Pamela Frank or Augustin Dumay - risk-taking, vulnerability, despair - well, that's just not who Kavakos is.