• Bach: The Art of Fugue

This is just to give an illustration of why links to recordings help. It is not known what instruments Bach intended The Art of Fugue for, and it has been recorded for different instruments. I love these two recordings of it:

• Amsterdam Loeki Stardust Quartet on recorders
• Canadian Brass

I also have this recording, which I listen to less often:

• Quartetto Bernini

I also have a harpsichord/clavichord version in my Brilliant boxed set of Bach's complete works.

I haven't yet found an organ version I'm interested in.