COMPOSER: BIRTWISTLE PERFORMER: TETZLAFF.

The article focuses on the views of composer Arrison Birtwistle and soloist Christian Tetzlaff on the the Violin Concerto that will be performed in Boston, Massachusetts. It says that Birtwistle's revealed that he is more concerned on duration and scale and aspects of time, in which he regarded as the most difficult things to estimate as a composer. Moreover, Tetzlaff expressed the difference of the new concerto with the previous ones he performed in terms of his collaboration with a composer.