Because notes have letter names, it is possible to generate musical themes from words or names. One of the earliest and most popular themes has been the name of one of the greatest composers of organ music: Johann Sebastian Bach. Germans use the letter B for what we call B-flat and H for B-natural, making Bach’s name into a concise chromatic motif:

Videos:
Anders Börjesson – Improvisation fugue B A C H – Mariestad Cathedral
Tomáš Ibrmajer – Organ Improvisation on B-A-C-H – Bazilika minor, Brno
Martin Látal – Improvisation on the Theme B-A-C-H – Šternberk
Tomasz Adam Nowak – Improvisation on BACH – Hauptwerk organ