In the movie, Scarlett Johansson's Siri-like character sings it as a disembodied voice in a duet with star Joaquin Phoenix as he accompanies her on ukelele, expressing their unusual love. Both that version and the solo Karen O version are beautiful songs, but now, she may have made it even better in a re-recording that includes Jewish indie rock star Ezra Koenig from Vampire Weekend.
This version is part of a three-track EP that's due to be released this week.
"I wrote the song as a duet," Karen O told Rolling Stone. "I was really excited at the prospect of getting to record it with a male vocalist. Ezra was super cool and open. He slipped into character like a champ and damn he's got the goods."
Listen to the duet below.