Once is a 2007 Irish romantic musical drama film written and directed by John Carney. The film stars Glen Hansard and Marketa Irglova as two struggling musicians in Dublin, Ireland. Hansard and Irglova had previously performed music as the Swell Season, and composed and performed the film's original songs. Once spent years in development with the Irish Film Board and was made for a budget of EUR112,000.

A rough cut of the film was previewed on 15 July 2006 at the Galway Film Fleadh, but the film was subsequently turned down by several prestigious European film festivals. However, once finished, it secured spots at the 2007 Sundance Film Festival on 20 January 2007 and the Dublin Film Festival in February 2007, and received the audience awards at both events.  The film was first released on cinema in Ireland on 23 March 2007, followed by a limited release in the United States on 16 May 2007. After its second weekend in release in the United States and Canada, the film topped the 23 May 2007 indieWIRE box office chart with nearly $31,000 average per location. As of 28 March 2009, Once has grossed nearly $9.5 million in North America and over $20 million worldwide. After 2007's box office success and critical acclaim, it won the Independent Spirit Award for Best Foreign Film. Steven Spielberg was quoted as saying "A little movie called Once gave me enough inspiration to last the rest of the year". When informed of Spielberg's comments, director John Carney told Sky News, "in the end of the day, he's just a guy with a beard". At the time of this interview, Carney himself was also wearing a beard.  The song "Falling Slowly" won the 2007 Academy Award for Best Original Song. The nomination's eligibility for the Oscar was initially questioned, as versions of the song had been released on The Cost and The Swell Season albums, but this was resolved before the voting for the award took place. The AMPAS music committee satisfied themselves that the song had indeed been written for the film and determined that, in the course of the film's protracted production, the composers had "played the song in some venues that were deemed inconsequential enough to not change the song's eligibility".

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