The explosion of ‘blockbuster’ museum exhibits designed to draw in thousands upon thousands of art lovers has been well-documented. But what you may not know is that, more often than ever, the museum experience is little more than a bought-and-paid-for package distributed to your local gallery by giant for-profit corporations like the omnipresent Clear Channel. “Just as it changed Broadway theater roadshows and the concert business, so Clear Channel is changing the economics — some would say the soul — of a museum culture that traditionally has built its own shows or borrowed them from peers. It’s making some institutions look too much like theaters for hire. And it’s a trend that has many old-line museum people worried.”