The room acoustics do make a difference, and I think the folks are on the right track pointing to microphone errors & higher ordered harmonic distortion created by limitations of the recording/playback equipment. I also wonder if inaccuracy of dynamics can create some loss of 'sweetness' due to changing the natural rise and decay of the instrument to a more abrupt note.
On the other hand though, George Bush might somehow be responsible.
On the other hand though, George Bush might somehow be responsible.