Hierarchy of genres refers to the classification of artistic works based on the conventional notion of their importance or value in society. The concept of hierarchy of genres has been prevalent in art history since the ancient Greek period, and it has evolved over time. Synonyms for this term include classification of genres, gradation of genres, and valuation of genres. The categorization of artistic works varies across cultures and periods, with some placing more emphasis on certain genres. While hierarchy of genres may have been a helpful guideline for artists and patrons in the past, modern art challenges such conventions and encourages the exploration of different forms of expression.