The duet speaks of the infinite but tragic like involving Chang'e and Houyi, that are depending on the Chinese myth of the moon goddess, upon which the movie relies on. Amongst lots of artists who may have recorded versions of "Always and Forever" is the American R&B vocal team Whistle, https://milomsuyb.blogpostie.com/58349151/5-easy-facts-about-always-and-forever-mine-described