What are the characteristics and differences between all major and minor keys?

The characteristics and differences between major and minor keys lie in their tonality and mood. Major keys generally sound bright, happy, and uplifting, while minor keys tend to sound darker, sadder, or more mysterious. The main distinction is the third note in the scale - major keys have a major third interval, creating a more cheerful sound, while minor keys have a minor third interval, resulting in a more melancholic or somber feel.