Do you and your future husband have any common musical taste - or movies with a recognizable soundtrack? DH and I (and his entire family) love John Williams - we see him at Tanglewood every year. So at our wedding reception, the family was introduced to the theme from Star Wars, and DH and I got Indiana Jones/Raiders of the Lost Ark.
(I personally would have preferred the Imperial March, but that was too much Star Wars for one wedding...)
MY DH picked Another One Bites the Dust.
I did Bruno Mars's Marry You.
I've heard / seen the Godfather theme and 2001 Space Odyssey monolith theme. I also like Jack and Sally's song at the end of Nightmare Before Christmas