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The artist doesn't necessarily need to be aware of every theory or mechanic which he or she can, in the most advanced way possible, write in the most advanced way his or her emotions want to express.
Different audiences require different things, as it can be found from those who like Rap to those who like Classical music; or from those who like the Pre-Raphaelites to those who like more modern/avant-garde works of art. Further, it can easily be found that certain audiences find more pleasure in the simplest of arts than the most complex: some people prefer the basic garage-band over the populists' band which plays in stadiums; some people find pleasure in looking at a plain white canvas where others prefer a scene with "depth" and a collage of colors. That is to say, on every level where art is created - from the most basic to the most complex - it satisfies a portion and an even further portion of some culture; or in modern times, it satisfies a "general culture," as the audience is now spread across the planet rather than in focused centers.
In principle, it would be wonderful to hear music which is "educated" to some extent rather than modern bands - which I personally find irritating due to their blatant repetitiveness, over-used rhythms and harmonies, and, often, very dim lyrics (which oddly enough, from some of the people I've talked to about it, at least pertaining to modern music - makes up the importance of the song rather than all of the elements of music which have traditionally composed something that has even qualified as a "song"; it seems that people prefer that kind of "person-to-person" connection with lyrics rather than the abstractness of "just sound"; but that's a conversation for a separate thread).
This suggests the variance of the audience: that anyone may like what they like, regardless of the objective aesthetic quality of the work, which itself varies work to work. It may be found that this is so because of the emotional connections people find in a work of art (which is, of course, a physical phenomena): that, depending on their previous emotions, and perhaps depending on the arts they saw or heard when they were children, and depending on their physiology (their sensitivity to colors and sounds) - creates unique abilities to appreciate certain works over others.
Whether the artist is "good" or "bad" depends solely on the quality of the work he produces. An artist can't expect to satisfy every audience; he satisfies himself or herself first and most importantly, his or her own emotions and expressions; then those who find a similarity between the expression of the art and the expression within themselves becomes satisfied, or at least somewhat so - there's a lot to say about psychology in art, I think. But to try and satisfy everybody; it may end up being that nobody, or at least very few people, becomes satisfied: there are too many expressions, too many feelings in the world to satisfy them all. In a singular work, I think it would be on the best of occasions that a work only go after one or two of those feelings or expressions.
To quote Martin Heidegger from his "The Origin of the Work of Art": "By the work; for to say that the work does credit to the master means that it is the work that first lets the artist emerge as a master of his art. The artist is the origin of his work. The work is the origin of the artist. Neither is without the other." That is a basic principle which I think has some truth to it. The origin of both the artist and his or her art is, however, a separate and much longer conversation to have.
"By a sarcasm of law and phrase they were freemen." - Mark Twain