The movie is 5 years old or more. It's English, I think the movie takes place in Ireland (I can be wrong). A woman with a boy went off in search of a living. She met a guy playing (I thing) the guitar. She liked his music, passed by many times and they became friends. After that they formed a music band and even released a CD. At the end she left (I think).
Please, any suggestions will be welcome, even if some details are off.

I think it may be "Once".
Once (2006) - IMDb (http://www.imdb.com/title/tt0907657/)

Thank you, raisingale.