Building collections and providing patron access can be a challenge for librarians working with diverse Latin American music collections. Simply acquiring these materials without the usual vendor access can be difficult, requiring targeted efforts (or serendipitous donations). The effort to organize materials into coherent and usable collections may be complicated by unfamiliar languages and genres, which then become barriers to description and discoverability. As always, challenges indicate opportunities. Though collections are diverse and are found in many locations around the world, a variety of projects have made, and continue to make these collections widely available. Approaches to how the projects are developed and maintained are as diverse as the collections themselves. In this session, the people who research, acquire, organize, index and archive the materials will describe their projects in the context of the challenges they face, and the opportunities they discover.