A tetrachord is a row of 4 notes arranged in a stepwise motion. The distance between the outer notes is a perfect or augmented fourth. Here are the names:
I prepared a simple test where you can check, if you know the 5 tetrachords (there are 12, actually, but that's for another time). If you don't know how they are constructed - don't worry, I have given you the clues and hints in this test.
Every major or minor scale and many modes are constructed out of these tetrachords so they are very useful to learn for every organist.
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Don't have an organ at home?
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.