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A perfect fourth is an interval that spans four letter names and five half steps. It is considered consonant and has a strong, stable sound.
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Perfect Fifth: An interval that spans five letter names and seven half steps. It has a bright and open sound.
Major Third: An interval that spans three letter names and four half steps. It has a happy and uplifting sound.
Minor Seventh: An interval that spans seven letter names and ten half steps. It has a tense and dissonant sound.