The E natural minor scale contains the same notes as the G major scale. The only difference is the note they start and finish on. Because of this, G major and E minor are said to be relative keys. Every major scale has a relative minor and vice versa.
The natural minor of the relative key can be created by starting on the 6th degree of the major scale. This is demonstrated as follows with the notes of the G major and E minor scales.
Because relative major and minor keys contain the same notes, they also use the same key signature, i.e., the key signature for both G major and E minor consists of one sharp written after the clef. Here are some more melodies in the key of E minor.