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crepuscular-tree t1_jdbajyq wrote

This is a great answer!

To take it a bit further, “Do” is a single note as you said. “Do Re Mi Fa So La Si Do” refers to the difference between the notes (eg jump two, jump two, jump one). And that pattern of differences is called a key.

You can start anywhere you want though and decide that note is “Do”. If you start on C and play that pattern, you are in the key of C. If you start on a D and play the same pattern, you are in the key of D.

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