Count Pachta invited Mozart for dinner on 6.II.1787, but at first asked him to compose the promised German Dances; so he did (KV 506) (The location is insure; possibly this event took place in another, now demolished, Pachta palace on the corner Mikulandská/Národná) — also Beethoven was a guest here — the “Prager Singakademie” occupied a building in the former palace garden at the river (1840–99); demolished.