My favorite "counterhistorical anecdote": did Vienna get sick of Haydn and Mozart and have a neo-Baroque movement around 1800? Surely not, but that's what Antoine Reicha says!

Everyone knows that real and fine instrumental music was created by Haydn and Mozart. It had been played so much that by the beginning of 1800 the Viennese public was already sick and tired of it. A new music, more or less baroque in style, was replacing it.

This is from Reicha's autobiographical notes, which you can find an English translation of in the appendix of Millard M. Laing's dissertation on Reicha's wind quintets, "Anton Reicha's Quintets for Flute, Oboe, Clarinet, Horn, and Bassoon".

In his wonderful book "The Symphony in Beethoven's Vienna", David Wyn Jones dismisses Reicha's observation as obviously untrue; I'm not sure whether any other scholar has commented on it. I'm certainly not aware of any pieces that fit Reicha's description, but who knows . . .

There is another brilliant book: Mary Sue Morrow's Concert Life in Haydn’s Vienna, that has a list of public concerts; but you see a lot of Haydn and Mozart there as well.