Quote Originally Posted by Cheryl Jacobs
They look differnt on paper, but are indistinguishable to the ear.
Not to me... It depends on what the note is "doing", and in which key. The tempered scale was a brilliant innovation which allowed changer in key without having to retune. This was done by making all notes ever-so-slightly off. You won't realise how much until you've heard an untempered instrument - and tried to play it!