Good morning everyone 
Cloudy here, may brighten up late afternoon, could get some rain for a time.
Ros, I remember you mentioned that you had sung the Ave Maria at your last concert 
I posted the clip as a piano solo for a direct comparison with Bach's prelude.
Although Ros would know this, for the benefit of those who don't Bach's Well-tempered Clavier is a set of preludes and fugues for each key in the chromatic scale. That's the number of keys in an octave on a piano - 7 white keys and 5 black keys. Each of those can be played with a major scale and a minor scale. So there are 24 difference scales.
I hope everyone has a good day