adjective: relating to beauty or to the study of the principles of beauty, especially in art
noun: the set of principles on which an artist’s work is based,
the study of the nature of beauty, especially in arts such as painting and architecture,
the beautiful qualities of something,
(philosophy) a philosophical theory as to what is beautiful
Ramsay
The relations which music has to mechanics, the sphere of centers; to geometry, the sphere of measures; and to arithmetic, the sphere of numbers, show how deeply seated music is in the nature of things, and how independent it is of the will or choice of the musician. His composition may take any form his inspiration may suggest; they are subject to him; but as to the nature of music and its laws, he must keep himself subject and obedient to them. Music is of the aesthetic; but the aesthetic is of the nature of things. [Scientific Basis and Build of Music, page 92]
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