Y ou know Bach's Prelude No. 1 in C? Play this like that. Ebb and flow the tempo slightly to emphasize the chords that contain more tension and give the sweet feeling of release a the chords that resolve that. Let your dynamics follow in a similar way . Y ou'll notice there is very little marking in the score and this is intentional. Atone point the "well-tempered clavier" was a new instrument and Bach wrote for it in a way that allowed for the player to explore the depths of its expressive power .
Today , the vibraphone is 103 years old (very young for an instrument of its popularity and usage). I want you, the expert player , to explore its depths, show off every detail of this beautiful instrument and ensure that is will be here for as long the piano. I personally like the sound of harder mallets, but I trust you. Do whatever you think is best.