----> What about the song?

"Falling Slowly" is an Academy Award-winning song, written and performed by personal and professional partners Glen Hansard and Markéta Irglová. It appeared in the couple's 2006 film Once. The film was eligible for the 2007 Academy Awards, awarded on February 24, 2008. It was chosen over the choral gospelsong "Raise It Up" from August Rush and three songs from the postmodern Disney musical Enchanted. For some time, the song's eligibility for an Oscar was in dispute, as it had appeared in 2006 on a CD issued by Hansard's band, The Frames as well as in the movie Beauty in Trouble and it had been performed by the couple in various European venues. The Academy ruled that because the song had been composed for the movie, and the prior public exposure during the long period that the movie took to produce had been minimal, it remained eligible. [from Wikipedia]

----> What about the movie?

Once is an Academy Award winning 2007 Irish musical film written and directed by John Carney. Set in Dublin, this naturalistic drama stars musicians Glen Hansard (of popular Irish rock band The Frames) and Markéta Irglová as struggling musicians. Collaborators prior to making the film, Hansard and/or Irglová composed and performed all but one of the original songs in the movie.Shot for only €130,000 ($160,000), the film was very successful,earning substantial per-screen box office averages in the United States.It received extremely enthusiastic reviews and awards such as the 2008 Independent Spirit Award for best foreign film. Hansard and Irglová's song "Falling Slowly" received a 2008 Academy Award and a 2008 Grammy nomination, and the soundtrack as a whole also received a Grammy nomination. [from Wikipedia]