Two music historians are working at a University. One notices the other making notations on a very old sheet of music.
"What are you doing?" inquired one historian.
"Oh, I'm just making some notations on this old sheet music", replied the other.
"What era is that manuscript from?"
"It's a pre-classical piece from the late 18th century."
"Don't you know you shouldn't make revisions to a pre-classical work?"
"Why, doesn't everybody know? If it ain't Baroque, don't fix it!"
[I had just donated two pints of red blood cells when I thought of that. That probably explains a lot.]