|Image von der Wik|
Johann Georg Albrechtsberger was an Austrian composer who became so famous that Ludvig van Beethoven sought him out for composition lessons. Beethoven had originally studied with Josef Hayden but Beethoven's temper kept disrupting the study and so Hayden recommended his friend Albrechtsberger as a replacement. Since Albrechtsberger had published the (to that time) definitive book on music theory and composition, Beethoven eagerly agreed.
What was a surprise to me was that music for the Jews Harp was a thing in late 18th Century Vienna, and that Albrechtsberger was considered one of the greatest composers for it. It's not at all what you're expecting, although today's musicians don't seem to play multiple Jews Harps at the same time as did musicians of the day.
Johann Albrechtsberger was born on this day in 1736.