Well then, you and your friends have an interesting definition of "artist". If something is an artform, and somebody is active in that artform, isn't that person an artist? I don't quite get your logic. Think of art as an umbrella. Music is but one of an infinite types of art, all of which are under the same umbrella.
So, by your logic, when I'm singing in a musical, I'm being artistic. Yet, when I'm singing in choral, I'm merely technically proficient? But that would be silly - you wouldn't actually argue that, would you? You wouldn't dare say that every member of every chorale and every orchestra is merely technically proficient. That would be quite offensive.
Let's say you've got three guitar players. The first, we'll call him John, is very technically proficient, but isn't very creative. The second, Mary, is also technically proficient, and is really quite creative. The third, Ted, is somewhere in-between.
So, by your rigid rules, Mary is the artist, and John is not -- he is only technically proficient. But what about Ted? How creative does someone have to be before they pass your artistic test? At what point do you cross that line from merely technically proficient to artistic?
The point I make is that this is not a black/white issue. With artistic creativity, there are shades of grey, and it is impossible to make any logical cut-off point between one and the other. John, after all, isn't a robot. He may not be very creative, but he's got at least a tiny bit of artistic abilities. Who are you to say that he's not an artist?
I really appreciate that you chose to continue our discussion, as I find your objections very important.
An important factor when talking about art is the intention of the artist. (That's what I meant when I talked about the "purpose" of art; art does not serve a purpose like, for example, a spoon does, but still does not exist just for its own sake)
Another thing that I would consider characteristic for art is spirituality - that's the whole making-people-think-thing; art, like science, is a means to find "the truth".
Art is a form of communication between the artist and the person dealing with it, this means that art doesn't work when it's merely "consumed".
All these aspects can also be true for music, or for any "artform". The representation however belongs to the technical and not the artistic aspect of a piece. If the artistic "value" rose with increasing techical proficiency and that was the only criteria of evaluation, then, taking film as an example, those pictures that had the best image and the best sound, or in short, the most expensive gear, or those that applied the rules of composition in the "best" way, would be automatically the best movies, but we know that this is not the case.
Also, creativity can't be measured. Saying: "Well Person A is the best guitar player in the world but only 50% creative, whereas Person B is only half as good in playing guitar but twice as creative, who's the better artist?", it doesn't work that way. An artist is someone who creates pieces of art; and I already mentioned what I find characteristic for pieces of art.
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