I was wondering if some of the classic trumpet pieces played up or down by a 1/2 or whole step would be decernable without having a reference pitch close by.
My gut tells me that if the Haydn or Hummel was played in a different key most of you who have played it either professionally or for recitals would be able to tell. I am not sure changing the pitch electronically would be as easy to tell as really transposing it.
Do we have any brave soul(s) who could record a few measures of a few famous pieces and see how the forum would fair? I think the introductions would be the easier to decern.