电影<Once>，两颗漂泊困顿心灵由音乐而起的短暂相遇相知，没有开始没有结局，只美在曾经。
柏林夜晚的街头空旷无人，一把破了三个洞的老吉他，吸尘器修理店老板儿子忘情地放歌。掌声，10分硬币，一位陌生女子，她问他歌是写给谁的，他爱她吗？她说如果他给那个女孩唱这歌她肯定会回来。
第二天她拖着自己坏掉的吸尘器找到他，他们去一家好心老板经营的乐器行，在那里她可以免费弹钢琴，听完她弹的曲子，他说真美。
于是他们合奏了他的歌，弹奏与演唱之间，有火花在跳跃。
I don't know you
But I want you
All the more for that
Words fall through me
And always fool me
And I can't react
And games that never amount
To more than they're meant
Will play themselves out
Take this sinking boat and point it home
We've still got time
Raise your hopeful voice you have a choice
You've made it now
Falling slowly, eyes that know me
And I can't go back
Moods that take me and erase me
And I'm painted black
You have suffered enough
And warred with yourself
It's time that you won
Take this sinking boat and point it home
We've still got time
Raise your hopeful voice you had a choice
You've made it now
Take this sinking boat and point it home
We've still got time
Raise your hopeful voice you had a choice
You've made it now
Falling slowly sing your melody
I'll sing along
他借给她CD机和一支他觉得太romantic而未谱词的曲子，深夜她穿着睡衣跑去杂货店买CD机的电池，回来的路上合着他的曲子唱出自己填的歌词：
Are you really here or am I dreaming
I can’t tell dreams from truth
For it’s been so long since I have seen you
I can hardly remember your face anymore
When I get really lonely and the distance calls its only silence
I think of you smiling with pride in your eyes a lover that sighs
If you want me satisfy me
If you want me satisfy me
Are you really sure that you believe me
When others say I lie
I wonder if you could ever despise me
You know I really try
To be a better one to satisfy you for you’re everything to me
And I do what you ask me
If you let me be free
If you want me satisfy me
If you want me satisfy me
她说他的歌一定会红，他们去找音乐制作人，去找录音棚，去街头找乐队，一个周末的时间，他们录了自己的第一支歌：
So, if you want something
And you call, call
Then I'll come running
To fight, and I'll be at your door
When there's nothing worth running for
When your mind's made up
When your mind's made up
There's no point trying to change it
When your mind's made up
When your mind's made up
There's no point even talking
You see, you're just like everyone
When the shit falls all you want to do is run, away
And hide all by yourself
well there's no point that's gonna warn to help
When your mind's made up
When your mind's made up
There's no point trying to change it
When your mind's made up
When your mind's made up
There's no point even talking
When your mind's made up
When your mind's made up
There's no point trying to change it
So, if you ever want something
And you call, call
Then I'll come running
歌曲录完，他要去伦敦找以前的她，她要和自己女儿的爸爸生活在一起，他们分开了。
他看着以前满是欢笑的录像写歌给心里深爱着的女子，也曾在深夜拨通她的电话，只为听那句录音留言。终于他决定带着自己的歌去找远方的那个她，像现在这个陪他唱歌的她说的那样“你唱这样的歌给她，她肯定会回来”。
她跟小女儿和自己的母亲住在一起，略显贫寒的家里常有热闹的邻居聚会，她曾给孩子的父亲唱自己的歌，他不明白也不在乎，可是为了女儿她妥协了，为了一个完整的家。
相遇又分离，他们之间有的是音乐、是懂得、是欣赏。他带走了他们一起录的歌，留给她一台钢琴，她在热闹的家里弹他送的钢琴，望着窗外金色的阳光……
整部片子没有绚丽的电影技巧，甚至像自己用DV拍的生活片段，却时不时有很温暖或很凄凉的东西伴着清丽的爱尔兰曲风戳进心里，不时提醒自己也有过曾经。
那段日子曾经以为遇见的就是这辈子等待着即将一起走下去的那个他了，第一次见到他时分明感觉到有种叫Sparkle的东西在两个人眼里，还以为那就是传说中的一见钟情。回来的路上和他并肩，不时手臂间的摩擦让人脸红心跳，之后几天里收到他的短信都会为之振奋一整天。在布拉格咖啡店，两人中间一只平常无奇的白色茶壶，各自面前白色的茶杯里红色的茶汁茵氲着香气，他的手在我的手上贴了一下，问了声冷吗，肯定又脸红了。之后说了很多也说到很远的事情，脑子里全部是甜蜜的混乱。走出咖啡店，他握了我的手又问，还冷吗，我摇摇头把手乖乖地放在他手里。路灯从身后照来，把影子投在地上，两个人的影子，就像从前很多次自己看自己影子时想象中的样子。我把露在他手心外的两只手指缩回来，整只手让他握着，是那么“对”的感觉，或许这就是<Sleepless in Seattle>中安妮感受到的Magic，也像Tom Hanks在里面说到的"It feels like going home to where I never know"...
三次见面加一次牵手，不足三周感情的漩涡里，似乎又变成一个纯情的傻女孩，天真地认为那是Angels falling, I met my Mr. Right, we would live a happy life forever...
只是生活中永远没有童话，现实总是在愚弄人，假如有假如……
正如片名<Once>，不多不少，曾只一次，或许才真的美好。
背景音乐：电影主题歌<If you want me>