I've just bought a new CD of Mozart's Requiem. I put in on and said to my dd (who is 7) "this is one of the finest pieces of music ever written". She said "Oh, we have sung parts of this in school. Did you know that all of it after the Lacrimosa was written by Mozart's pupil, because Mozart had died half way through?"
I was completely stunned.
Hurrah for school!