the remainder of the chord being E, A, D and G – the same as the bottom four strings of the guitar! See below for a few useful major and minor 6/9 voicings, plus an extra twist here and there.

You don't need to know many guitar scales to ... then strum all six strings. Just as with the C chord, Em is almost identical to a scale, this time the E minor pentatonic scale.

Harmonic minor keys are used when writing chords. There is another version of the minor key known as the melodic minor. This is used when writing a melody. Each key signature has two possible keys.