It's about a music composer (or song writer) who has a new relationship with a girl and they decide to spend some time together in a small village farm while he's trying to find the inspiration about a music project at the same time.
He's not inspired at all until he discovers that his ex girlfriend is about to stay in the same farm for a few days.
He secretly spends some time with his ex and they remember the old good times they had and in the end he's inspired and he writes the music he needed for his job while he decides to give his ex girlfriend a second chance.

Not sure but probably a french movie.