The premise of Eastern Echoes with Diana Ratsamee, the new music program at KEXP, sounds simple: a three-hour weekly journey through the vast realm of music from Asia and the Asian diaspora. As a conduit for a multicultural community, it’s more than a show, creating an impact that runs deep with global reverberations. Long overdue and largely ignored, particularly in the vernacular of the Western world of music, the Asian diaspora is all around us, ever-present in our overseas communities.