Here’s another article that explores some of the impact of the arts in education. The full article contains several links to some interesting studies/data.
"Engaging with art is essential to the human experience. Almost as soon as motor skills are developed, children communicate through artistic expression. The arts challenge us with different points of view, compel us to empathize with “others,” and give us the opportunity to reflect on the human condition. Empirical evidence supports these claims: Among adults, arts participation is related to behaviors that contribute to the health of civil society, such as increased civic engagement, greater social tolerance, and reductions in other-regarding behavior. Yet, while we recognize art’s transformative impacts, its place in K-12 education has become increasingly tenuous.
A critical challenge for arts education has been a lack of empirical evidence that demonstrates its educational value. Though few would deny that the arts confer intrinsic benefits, advocating “art for art’s sake” has been insufficient for preserving the arts in schools—despite national surveys showing an overwhelming majority of the public agrees that the arts are a necessary part of a well-rounded education."-Brian Kisida and Daniel H. Bowen