Are there any primary sources* that speak about art, literature, music, and so forth as being valid, or even necessary, forms of service and appreciation of God? Is there anywhere that explicitly states that appreciation for good music, say, is part of understanding and appreciating God's world? Are there any sources that expressly state that there is religious merit in "High Culture"?
*When I say primary, I ideally mean pre-1500's. That being said, anything, at any point in time, that is otherwise a widely accepted source would be fine for our purposes here. Nonetheless, I would ideally like Medieval or earlier.