Very good, Chris. Although my previous personal experience and study of other test results didn't leave much doubt that both 320 kbps CBR or the "extreme"VBR(around mid 200s kbps)would be audibly transparent(even with about 80% of the audio data discarded), I listened on both speakers and headphones.

I paid special attention to the first 12 seconds before the singing attempt began, particularly the 9th though 12th notes, which have the sort of content which might demonstrate a difference. After several trials on each of the four samples, nothing was heard would support anything beyond a pure guess.

This might be surprising to some who claim to be able to hear a difference even between pieces of connecting wire, but it's the reality of modern audio technology.
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Enjoy the music, not the equipment.