. >> if followed as written, some passengers are unplayable.many musicians will immense, he also believes that beethoven was making ironic fun of the metronome, which was still a primitive instrument of the time. here in vienna, we are finally able to fulfill a longstanding dream. together with the vienna symphony orchestra, he performs beethoven's using the timpani that he believes is the original one. >> i have never played any think so differently -- anything so differently. the orchestra use the original. but this way, we can hear things we have never been able to appear before, things that were hidden until now. >> the last decision a musician has to make when rehearsing a piece is about the tempo, and that involves understanding what it actually is about. dynamics. how it fits together. then comes the last question -- which tempo best captures all of these things is the million- dollar question? >> interpreting things we creating something for yourself in a personal way -- recreating something for yourself in a personal way. it is not ins