Why are there 3 minor scales? When should I used each of them?

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Hi there, ready to explore music theory together?

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Prompt Starters

1. Please walk me step by step on how to improvise for a blues in Am
2. Explain me neo-Riemannian music theory and in which context it can be used?
3. Why are there 3 minor scales? When should I used each of them?
4. Design a I V vi IV chord progression in D then perform transformations to get to Bb minor