If you want to have your heart ripped out, stepped on, and broken to pieces, I highly recommend watching the Oscar-nominated Belgium film, The Broken Circle Breakdown. It's a heartbreaking tale of love, loss, and bluegrass music. Not unlike the 2006 film, Once, the music plays a central role in progressing the plot. Music brings the two main characters together, music keeps them together, and music brings everything to a heart-wrenching conclusion.
If you would rather vie for a less messy experience in which you do not have to wipe tears off your face or pick your heart up off the floor, I highly recommend listening to the fantastic soundtrack. All of the music is performed by The Broken Circle Breakdown Bluegrass Band whose members include the two leads in the film, Johan Heldenbergh and Veerle Baetens. The standout track for me is the song in which the two characters duet on in the beginning on the movie, "The Boy Who Wouldn't Hoe Corn", an old traditional song. I watched the movie just two nights ago and I've listened to this track no less than eight times since watching. It helps set the stage for the film but also works incredibly well as a standalone track, much like the rest of the soundtrack.
Watch the movie, listen to the soundtrack, but you've been warned - this is not an easy movie to watch.