This is an old Beatles song as done by bluegrass sensation, Alison Krauss, who has won more Grammy awards (27 wins, 41 nominations) than any other female singer in any genre and who ranks tied for second overall. This song was written by Paul McCartney, though Lennon-McCartney gets credit on the album cover, though it contains several signature McCartney marks. It was released on the album "The Beatles", the one with the green apple on the record.
This live version is nice, though the one on her album has a more prominent banjo line that I like much better. In fact, I think I'll include a link to it and to Paul McCartney's own recording (sans Beatles).
This song gets me. It's got a permanent place on my love songs playlist. Here's Alison live:
Here's the better version with the nice strong banjo line:
And here is Sir Paul all by his lonesome with his left-handed acoustic guitar with a very nice version of his song, "I Will".
I love that signature McCartney high note in there. This song expresses the longing for that one special person that makes your life complete. Here rattling down toward the end of my life, I realize what an awful hole it would make to lose that person and how much I have to trust in God to make it come out all right end the end.