Feeling free while playing is one of our essential goals. We strive to make cello playing natural when it is, in the beginning, very unnatural. So much more can be acheived when one backs away and scans the process of playing from a place of calm, even when the music is very exciting. As Starker says, "don't get excited, create excitement." Enjoy Mark Summer and this high school student playing Julie-o by Mark Summer.
http://en.wikipedia.org/wiki/Mark_Summer