A key a basically just a guideline of which notes sounds good when played together or sequentially.
For example, if a piece is in the key of “C”, then you might want to stick to the notes Dm, Em, F, G, and Am. C, being the root note, is the note that the piece will most often come back to. So it is in the key of “C”, and the other notes I listed have been observed to sound the best when played with C in mind.
You don’t *have* to follow these rules, like I said it’s supposed to be more of a guideline than a rule.
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