Harmonica's Howl (Portuguese: O Uivo da Gaita) is a 2013 Brazilian drama film directed by Bruno Safadi. It stars Leandra Leal, Jiddú Pinheiro and Mariana Ximenes. The film premiered at the 42nd International Film Festival Rotterdam.The film is part of the "Operation Sonia Silk", a series of three feature-length films produced cooperatively, with the same cast and crew, co-produced by Canal Brasil and Teleimage. It tells the story of Antônia and Pedro, a couple that is facing problems in the relationship after the arrival of Luana. The two women fall in love and live a love story.