Once is an Irish musical drama that takes place in Dublin starring Glen Hansard, a talented Irish busker, and Markéta Irglová, a Czech immigrant who plays the piano as a hobby. Both actors are actually musicians (Hansard is the frontman for The Frames, while he and Irglová perform as The Swell Season), and composed and performed all the songs in the film. Songs are played out in a real-world fashion; many stem from Hansard's character nearly always carrying an acoustic guitar around with him.
The musical had a paltry production budget of around $150,000, but ended up being successful and critically acclaimed, grossing a little over $20,000,000 worldwide. It featured at the 2007 Sundance Film Festival and won an award for Best Foreign Film at the 2008 Independent Spirit Awards. Hansard and Irglová also voiced their characters on an episode of The Simpsons.