The relative minor can be found by starting on the sixth degree of the major scale and playing the natural minor scale. For example, to find the relative minor of C major, you would start on A and play the notes A, B, C, D, E, F, and G.
The relative minor has a different sound than the major key. The major key is bright and cheerful, while the relative minor is more dark and somber. This difference in sound is due to the different interval relationships between the notes of the two keys.
The relative minor is often used in music to create contrast. For example, a piece of music might start in a major key and then modulate to the relative minor to create a sense of tension or drama.
The relative minor is also used in some types of folk music and blues. In these genres, the relative minor is often used to create a more relaxed or mournful sound.