Bublé’s version is a direct homage to Dean Martin's 1954 recording, which turned the song into a global pop standard.
It was originally a Spanish instrumental called "¿Quién será?" , composed in 1953 by Mexican bandleader Pablo Beltrán Ruiz . Michael BublГ© - Sway (Official Lyric Video)
The song has a rich history that predates Bublé by several decades: Bublé’s version is a direct homage to Dean
Norman Gimbel added the English lyrics in 1954, shifting the theme from a melancholy search for love to a romantic celebration of dancing. Michael BublГ© - Sway (Official Lyric Video)