"Aesthetics is commonly perceived as the study of sensory or sensori-emotional values, sometimes called judgments of sentiment and taste. More broadly, scholars in the field define aesthetics as "critical reflection on art, culture and nature." Aesthetics is a sub discipline of axiology, a branch of philosophy, and is closely associated with the philosophy of art. Aesthetics studies new ways of seeing and of perceiving the world." (Source: Wikipedia.org)

Of Interest:  The word "Esthetics" is an alternative form of "Aesthetics."  Both are derived from the Latin Æ letter.  At least, in the USA,  the dental profession prefers to use "Esthetic." Esthetic seems to apply to form and shape more than art, music, etc.   The Medical profession leans toward the old Latin form, but either is correct.