Major scales give a song harmony, peace, and coherence, but minor scales (often thought of as their sour cousin) add interest. Which is why even popular pop songs commonly inject key changes to let rip a minor scale that sends the song from boring to Billboard.
If you're interested in learning a few minor scales, simply take a gander at this tutorial for beginners. You'll be run through the minor scale formula for A minor (1 1/2 1 1 1/2 1 1) and taught how to play the scale based on the same formula as the C major scale, just played at a different starting point.
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