You realize that socialism has never yet managed to initially take hold within a wealthy industrialized nation right? Good art and music is a byproduct of wealth abundance. China, Russia, Korea, Cuba, Vietnam, etc where all dirt poor backwater countries just prior to becoming socialist and nothing could of possibly risen their wealth to USA levels within the Cold-War timeframe.
Socialism causes poverty and capitalism causes wealth. When socialist countries get wealth, they become capitalist.
I'm also pretty sure the causation works the other way. If a country sells its resources, it has a finite amount of wealth. If a country creates new resources (arts in the broad sense) it has an infinite amount of wealth over time. If it combines its intellectual capital with its industry (arts in the narrow sense) it has an exponentially more infinite amount of wealth over time. You know why the Berlin Wall fell? There was a rock concert that was audible from the other side of the wall.
mayakosky, lilya brik, chagall, the futurist and constructivist movements, this song