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I would add to the discussion the fact that there is growing evidence that evolved traits can be pretty neutral.
http://www.physorg.com/news103206868.html
So our appreciation of art et al might well not confer a specific great advantage to us as a species.
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'Great advantage' is not a necessary evolutionary component, some small sniggly one will do or as the link points out, a neutral one may be do just fine also.
Genetics may be too low a level to be looking at it. There is no need for there to be a direct line genetic component for 'appreciation of art' since it likely operates at the cultural level. We don't have an 'appreciation of german' coded anywhere either.
thanks for the link, luckyme