especially if it differs from the root-3rd-5th of a standard major chord. In guitar circles, describing a chord as ‘G’ without any other information would usually mean a G major chord.

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 ...

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).