That's a musical number above, from the film "Bright Star" which was well reviewed when it came out in 2009, but which was afterward completely forgotten. I'll have more to say about the music in a minute.
The film's about my favorite poet of the Romantic Era, John Keats, and his never consummated love for Fanny Brawne. Reviewers liked the film, though some thought it was weak on story and was only saved by the performances. Some lamented that it never touched very seriously on Keats' poetry. They're right on both counts...well, half right...but if you liked films like "Shakespeare in Love," then you have to see it nevertheless.
I like a good love story, not only because I believe in the philosophy that underpins romantic love (discussed in previous posts), but because when these stories are done right they stimulate your thinking about everything else. To be in love is to live in a state of hyper awareness, when even the cracks in the sidewalk seem to have deep meaning. It's nice to be reminded of a time when we were fully alive, no matter how torturous it might have been in some respects.
To get back to the film's music: The top video is from the film and is a vocal adaption of Mozart's Serenade in B Flat, K361. For comparison, here's (immediately above) an original, instrumental version of the same music. The vocal version stands up pretty well, I think.