Tobias Friedrich Pfeiffer (also Pfeifer, ca.1751 - ca.1805), versatile musician, 1779-1780 in Bonn at the "Kurfürstliches Theater"and living with the Beethoven family in sub tenancy and teaching therefor the young Ludwig the piano. in this time Pfeiffer wohnte in der Zeit in Untermiete bei der Familie Beethoven und gab dafür dem jungen Ludwig van Beethoven Klavierunterricht. Later in Leipzig, where his composition "Die Freuden der Redlichen" was performed 1789 with great success. Pfeifer came after some travelling to Duesseldorf, working as music teacher. Beethoven supported his former teacher here financially.