...And what's 'Grout'?

That's the stuffing they put in between two pieces of music to make them resonate on the same plane.

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...hoopla involved is beyond my ken

there's a 'barbie' joke in there... somewhere... TEd???

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Although most cannot distiguish much over 15,000 hz, sounds in this spectrum add an ambiance to music that just ain't there with 16 bit sampling rates. This effect is very clear when reproducing the sound of a piano, and even more striking when recording cymbals... both of which gain lots of lively 'roundness' up there.

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Not to be a pain in the ears, but...

We aren't limited to what our ears and brains can detect.

... certainly, to what we can interpret with *them!?!?