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How do you make a note a tonic center? If any of the same seven notes can be a tonic, what makes it a tonic?

by it's function in the overall harmonic scheme, and through it's positioning and usage relative to the other notes.

"tonic" is another way of referring to the "key" of the song.

I know these words, question is exactly how these relationship work that a note becames tonic?

If I'm writing a song and want to make La the tonic, what should I do?