Can you please simply explain the definitions?
And then explain it in terms of triad, root notes, and inversions.
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Major and minor chords are both triads: a root note, a third, and a fifth.
The fifth is usually a perfect fifth, seven semitones above the root. However, a chord with a minor third may have a diminished fifth (only three semitones above the minor third), and a chord with a major third may have an augmented fifth (four semitones above the major third). In those cases, you’d typically call the resulting chord diminished instead of minor, or augmented instead of major.
Inversion does not change the notes from root, third, and fifth. It merely indicates which of the three notes has the lowest pitch: root position starts with the root, first inversion starts with the third, and second inversion starts with the fifth.
A major chord has a Major third and a perfect fifth. A minor chord has a minor third and a perfect fifth. You need to know your scales for it to make sense but I will try and demonstrate with an example anyway.
A perfect interval means that the note fits into both the Major and the Minor scale of the root note. So for Instance if you have the interval F-C It would be a perfect fifth because both F Major and F minor has a C natural in the scale.
Remember that only the Unison, the Fourth, the Fifth and the Octave can be perfect. The other intervals are either Major, Minor, Augmented or Diminished.
If you have the notes F-A-C. You first do the third. F major has a A natural. So that chord has a Major third and then again the C that fits into both the F Major and Minor scale so it is Perfect.
If we would have the chord F-Ab-C then we would have F - Ab which fits into F minor (It being the relative minor of Ab Major) and a perfect fifth again. We would then call this a Minor chord.