if you are a classical musician, or even if not, you ought to watch a youtube video...
you won't be able to stop! they are simply unbelievably brilliant on stage.
and check out this workshop they run! what a fantastic avenue for musicians to explore!
>igudesman & joo workshops
"The workshop explores often-ignored and less practiced aspects of music making and encourages musicians to be more open to such aspects, which may include improvisation, choreography, theatricality, psychology of performance, stage manner and presentation, different styles of music, classical and non-classical rhythm, composition, dramaturgy, and humor."