"Paul was at a piano lesson with the well-known blind composer and pianist, Josef Labor."
Josef Labor (1842-1924) was a Czech pianist, organist and composer. At the age of three he was left blind due to contracting smallpox. Labor was an influential music teacher. He taught many notable musical personalities including Alma Schindler, Paul Wittgenstein, and Arnold Schoenberg. Labor was exceedingly close to the Wittgenstein family. When Paul Wittgenstein lost his right arm in World War I, Labor was the first person he contacted to commission piano pieces for the left hand only. Although little known today, Ludwig Wittgenstein praised him as one of "the six truly great composers" along with Mozart, Haydn, Beethoven, Schubert, and Brahms.