Again, the 5th is omitted, which helps with fingering on the guitar, but it’s also common practice to stop chords becoming ... root (E) - major 3rd (G#) - dominant 7th (D) - #9th (G).

Harmonic minor keys are used when writing chords ... The major key and the minor key, which will begin on a different note. This is known as the relative minor. So G major, for example has ...