There's some brilliant heterophonic Scottish psalm-singing that still goes on in some churches. I seem to remember hearing a theory that Palestrina's stuff was originally performed this style as well, which is about a million miles from the recordings of it that you hear these days.
So-called authentic performance is a thoroughly modern aesthetic anyway...<runs>
So-called authentic performance is a thoroughly modern aesthetic anyway...<runs>

I love that kind of thing. Another reason for me to venture out of London at some point. 

