“Bella Ciao” has a long history rooted in popular culture and, like all folk songs, touches deep emotions of ordinary people. In all its versions, Bella Ciao has always been loved, never taken too seriously and with its many different versions, been a source of fun and public participation. This historic documentary traces the cultural history of the song and investigates its international success, using archival film and performances of its different expressions, including the secret of how it became an anthem for the series "Money Heist".