 I'm Hannah Yang, an NPR news reporter based in southwest Minnesota. I cover the towns, farms, schools, and businesses from Luverne to St. Peter. My work is made possible by the financial support of NPR members. Thank you. It's been 40 years since Prince released his iconic album and film, Purple Rain. Today, we look at his lasting cultural impact. From WAMU and NPR in Washington, this is 1A.