Everyone has heard of Johann Sebastian Bach's Well-Tempered Clavier – but hardly anybody knows anything about his journey to F sharp major.

In March of 1700, shortly before his fifteenth birthday, Johann Sebastian Bach set off on his journey. His destination: to create perfect music, music that unites heaven and earth in harmony. His search finally brought him to Lübeck, where he became acquainted with Andreas Werckmeister and the well-tempered tuning. In this tempering – and that is new! – you can play everything, all keys, in major and minor. But perfection has its price: All notes are "tempered" a bit, which means falsified; the music has a touch of artificiality from now on. And not only the notes and pitches – nature and people are also being tempered. Gardens are laid out with geometric precision, rivers are canalized, cities redesigned. Night becomes day thanks to street lighting, the pocket watch makes it possible to take along the time with you, the tuning fork enables choral pitch. The journey into an artificial world has begun. When Bach completed the Well-Tempered Clavier, he was overcome with profound doubt: Is not his work "only of this world" – perfect, artificial, profane?