The Mills Music Library and the Center for the Study of Upper Midwestern Cultures, along with many partners at the University of Wisconsin-Madison, present a growing collection of unique, historic, regional and endangered sound recordings with related documentation. These include recordings produced for immigrant, ethnic and indigenous audiences by American companies in the first half of the 20th century as well as more than 700 hours of original field and home recordings from the 1950s through the 1990s featuring the Upper Midwest’s culturally diverse traditional musicians.