...Bach left us with no instructions on how they should be played – loud, soft, fast or slow. So finding the "right" interpretation has been a Holy Grail of classical music. People follow their favourite pianist (or harpsichordist) as they would a knight in armour.Read the rest here.
It brought to mind a recital I gave as an undergraduate (ages ago) that featured a pretty galloping performance of a Bach prelude. Afterwards an obviously less than pleased professor (who shall remain anonymous) asked me why I had played it thus. I recall cheerfully saying something to the effect "That's the way Gould plays it". The icy reply: "Yes, but he is Glenn Gould."