Alejandro L. Madrid (’99 M.M.), Boston, wrote the book The Archive and the Aural City: Sound, Knowledge, and the Politics of Listening, which examines how sound in Latin American archives contributes to dialogue and activism. Alejandro, who is the Walter W. Naumburg Professor of Music at Harvard University, has previously written Tania León’s Stride: A Polyrhythmic Life and In Search of Julián Carrillo and Sonido 13.