There are many clues that the film
Once is an unconventional storytelling medium, but let’s start at the end. The credits-mercifully short- at the end of the film come very quickly to songwriting and performing credit. Lo and behold the actors and performers are one and the same. More incredibly, the actors, performers, and songwriters are one and the same. This tidbit is relevant because
Once is essentially a film about music. Critics have had an understandably difficult time attempting to categorize a film that is so musical but that is most certainly not a “musical.”