From today's top 100 Billboard songs to ancient Sumerian scripts, human beings have always sung about love. So how have love songs changed across the ages? Have they evolved to reflect society's understandings of love? Or have we been singing about basically the same things for millennia? Today, we'll look at one batch of love songs called the Loire Valley Chansonniers, made up of five songbooks from fifteenth-century France. Clare Bokulich, an assistant professor of musicology at Washington University in St. Louis, explains why these books are so special and breaks down the rare insight they give into not only historical understandings of love, but music itself.