major 7th (eg Emaj7), minor 7th (eg Em7) and dominant 7th (eg E7). Let's look at the options when creating these 7th chords from a C root note. For Cmaj7 the notes would be - C (root), E (3rd), G ...

Harmonic minor keys are used when writing chords. There is another ... This is known as the relative minor. So G major, for example has a key signature of one sharp, but this is also the key ...