Remember, all the notes come from A Ionian. Here we're building simple major and minor triads (three-note diatonic chords) ...

Harmonic minor keys are used when writing chords ... the basis of a whole range of musical styles. For example, the triads in C major are as follows: Triads can be indicated by Roman numerals ...

as it dictates whether your triad is either major or minor in tonality. As you may know, major chords sound bright and happy, where as minor chords sound more melancholic or sad. Locate the 3rd of ...

For example, G7 is made by taking the major triad of G (G - B - D ... Sometimes the final cadence of a piece in a minor key ends with a major chord instead of the expected minor.