In Johann Sebastian Bach's six organ sonatas, three independent voices sound interchangeably. The right hand plays the highest voice, the left hand the middle voice and the feet the bass. A true musician wants to play each voice as if for the first time, responding spontaneously to what the others bring up. To bring such a sung conversation to life with hands and feet, he listens with equal attention and love to all the voices simultaneously. It is a miracle that it can be done. When it succeeds, it all seems simple and natural. A world opens up to the listener, in which it is hardly imaginable that there is anything more beautiful than a trio sonata by Bach.