[eimrine]

Nyquist describes harmonic frequency while music can contain non-harmonic oscillations, also Nyquist theory tells about the maximum possible frequency, but this same frequency can be placed in such a way with respect for quantization points that it becomes a silence.

I like your point about editing, because trying to mix too much tracks in 44100 or 48000 makes spontaneus click sounds which are not supposed to be here.