Lang Lang is not difficult to understand, he is expressing the
music emotions on his face and body language. Wheras other
pianists can contain that emotions.
When you play a piece of piano, you are expressing the
composer's emotions through your ten fingers, arms and body.
For eg, Beethovan's music can be very very passionate.
Even for a quiet soothing piece like the famous Moonlight
Sonata, when you play it personally, you can feel the passion of
the composer.