Grade 4/SQA Higher
Check out Paul Barton’s performance:
For a digital realisation analysing the right hand keyboard positions, click on the following link: Bach C minor prelude
Look for the keyboard icon at the bottom of the page:

Click on it so that you can see the piano keyboard at the bottom of the screen, like this:

Use the other controls to give yourself a count in, set the volume, mute tracks and so on.