Why does the aeolian mode have a major second?

The Aeolian mode, also known as the natural minor scale, includes a major second interval between its first and second degrees. This major second creates a sense of tension and resolution typical of minor scales, contributing to the emotional depth associated with the Aeolian mode. The presence of this interval helps distinguish it from other modes, providing a unique sound that is both haunting and expressive. Overall, the major second is essential for establishing the mode’s character and tonal framework.