The musical element for the changing of seasons is Music Harmony.
Explanation:
A music harmony is obtained by the combination of various musical chords.
A musical chord is obtained when different musical notes are played together. There are different musical chords, but the common ones are major chord and minor chord.
A major chord gives a happiness or summer feeling. A minor chord gives a sadness or winter feeling. Therefore, playing different chords creates the music harmony and the feeling of change of seasons.
