Which characteristic does not belong on this list of classical music traits?
short, balanced phrases
mainly instrumental
strict forms
chromaticism
gradual dynamics
clear, pleasant melodies

"chromaticism" would be the best option from the list, since this is used primarily in more modern and experimental music, although it should be noted that there are elements of this in some classical music.

chromaticism

Explanation:

Classical music is the musical current that mainly houses music produced or based on the traditions of the liturgical and secular music of the West, mainly Western Europe. It covers a period of time that goes approximately from the XI century to the present, although this definition is not applicable to the music made in our century despite having the same characteristics, although the main characteristics of the genre were codified mainly between 1550 and 1900 , which is usually considered the characteristic period of production of classical music.

B. Athena; Athena was the Greek Goddess of Wisdom and War, she is a very important goddess of many things. She is the goddess of wisdom, courage, inspiration, civilization, law and justice, strategic warfare, mathematics, strength, strategy, the arts, crafts, and skill.