Here is a modern digital recording of Bach's 4th Brandenburg Concerto 1st movement... Segiswald Kuijken / La Petite Band (just happened to be sitting on my desk). This is an Apple Lossless file. The first minute and a half or so is the track as recorded. The second half is only the sound above around 12.5Khz. What do you hear?
A better test would be to omit the sound above 12.5 kHz at that point since there were arguments about those frequencies affecting the sound of instruments.