This is the story of the “Anthem of the Tangos”, the most emblematic tango of all time. We are taken through the story of The Cumparsita, from its creation, its debut at La Giralda, the first recordings, the legal debates and world repercussions of this tango that transcends its creator and its time. Thanks to documents and the memories of members of his family, Gerardo Matos Rodríguez, the author, ceases to be just a signature at the bottom of a sheet of music and comes alive as a bohemian, elegant, talented man full of mysteries and with a dark side as well.