When one speaks of Leonard Cohen, one immediately thinks of Hallelujah. There is no other song more iconic or striking. This documentary traces Cohen's creative process and proceeds to describe the repercussions of this single in popular culture (one of the songs most used in films, it has been covered by dozens of other singers, from Jeff Buckley in 1994 to a Hillary Clinton impersonator on SNL, on the eve of the 2016 election). Produced with the consent of the singer-songwriter, the filmmakers were given access to previously unseen archives that reveal how, despite being rejected by the record company, this song became a hymn to love. A film to get the whole room singing Hallelujah.