Soundtrack for the movie once?

what is the name of the song on the soundtrack for the movie once.

I'm not sure which song you're talking about, but here is the track listing for the soundtrack album:

All songs written by Glen Hansard, except where noted.

01. Glen Hansard and Markéta Irglová: "Falling Slowly" (Hansard/Irglová) – 4:04
02. Irglová and Hansard: "If You Want Me" (Irglová) – 3:48
03. Hansard: "Broken Hearted Hoover Fixer Sucker Guy" – 0:53
04. Hansard and Irglová: "When Your Mind's Made Up" – 3:41
05. Hansard and Irglová: "Lies" (Hansard/Irglová) – 3:59
06. Interference: "Gold" (Fergus O'Farrell) – 3:59
07. Irglová: "The Hill" (Irglová) – 4:35
08. Hansard: "Fallen from the Sky" – 3:25
09. Hansard: "Leave" – 2:46
10. Hansard: "Trying to Pull Myself Away" – 3:36
11. Hansard: "All the Way Down" – 2:39
12. Hansard and Irglová: "Once" – 3:39
13. Hansard: "Say It to Me Now" – 2:35