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A fourth and fifth interval, or as you called it, chord, is perfect is because it doesn't sound right in both a major or minor scale. Now, I know that isn't my most specific answer, but basically, one of the more plain major of minor chords, is a third. Let's say, if it was a C major third, it would have C and E, which would have to be major, due to the fact that there isn't a E in C minor, but instead, E flat. Yet, if it were to be a fifth interval chord, it would have to be perfect, because the G (fifth interval), appears in both C major and C minor. So...yeah...

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12y ago
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8y ago

Intervals like Unison,Octave,perfect fourth and perfect fifth are considered perfect because of the musical nature.

These intervals have a high consonance (=almost never sound dissonant) because it occurs on the root of all major and minor triad chords

For example: C Major = C E G

The interval from C to G is a perfect fifth

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Q: Why are fourth and fifth chords perfect?
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