The relative minor of C major is A natural minor. Starting on a different note means the gaps between scale tones and the root note are shuffled, giving the two scales different moods. The natural ...

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 signature for E minor.

And each of those minor keys is actually closely related to one of the four major keys: A is the relative minor of C major, E is the relative minor of G major, ...

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 signature for E minor.