Here is what I played for yesterday's church service as a prelude. In the above score, you can see the soprano and the bass parts written in. I also supplied the alto and the tenor parts and the bass part was played by the pedals.
This prelude is an interesting harmonization and modulation exercise. I wanted to modulate from F major to F# minor which is a very distant key to F major.
So I had to include a couple of intermediate keys: Bb minor (harmonic Subdominant of F major) and Db major (harmonic Dominant of F# minor changed enharmonically from C# major).
Then of course I had to go back to F major through these intermediate keys in the opposite direction.
Here is the full tonal plan:
Here is the PDF file for printing. Try to supply the missing middle parts yourself and avoid parallel fifths and octaves. I used only root position chords and chords in the first inversion. You can also add a little more dissonant four-note chords whenever you see a possibility.
After you are done, post your time to comments.
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Download paper manuals and pedals, print them out, cut the white spaces, tape the sheets together and you'll be ready to practice anywhere where is a desk and floor. Make sure you have a higher chair.