From LivingPianos.

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Welcome to LivingPianos.com, I’m Robert Estrin. Today’s subject is about movie music. What is the secret of movie music? It all comes down to thirds relations. I’m going to show you a little bit of music theory behind movie music. Once you know how it’s done, it will take the mystery out of it. I’m going to show you the trick! How does movie music bring out emotions to make you feel a certain way? It comes down to median or third relations. Typically, harmonies on the piano are based upon movement in fourths and fifths. Those are perfect intervals. For example, one chord to a four chord. That’s the movement of a fourth. Or one chord to a five chord. Those are your primary chords, One, four, five, one is a classic cadence in music.

Full Article:
https://livingpianos.com/the-secret-of-movie-music/