On 31 October 1783, during his return journey from Salzburg to Vienna with Constanze, Mozart writes to Leopold: “When we reached the gates of Linz [...] we found a servant waiting there to drive us to old Count Thun’s, at whose house we are now staying. I really can’t tell you what kindnesses the family are showering on us. On Tuesday, November 4th, I am giving a concert in the theatre here and, as I have not a single symphony with me, I am writing a new one at breakneck speed, which must be fin...