Certain songs, certain sounds cherish certain memories and this is one of the most beautiful things about music. Feist is one of those singers who can develop a lot of nostalgic feelings about certain memories with her music. Joy and sadness are two of the best emotions she is able to portray. A lot of people try to repeat this with her songs and their own voice, someone like James Blake for instance and he comes very close yet he doesn't quite have the same effect as she does. So just because it's such a beautiful song and it is now featured on soundtrack of the documentary about Feist playing live music.