We don't really have a couples song (unless you count the entire Norah Jones "Come Away With Me" album) but we do have a song for our wedding day. At least, I do.
It's "Kung Fu Fighting" by Carl Douglas.
The backstory is that I will always remember driving to the Mesa temple early in the morning with just my mother and her asking me why on earth I was playing that song. (It was on a CD mix I had made for when Seth and I drove down to Arizona earlier in the week.)
I was kind of on cloud nine and thinking it was so funny that she would comment on it, because I was about to get married and everything was happy and hilarious and wonderful and life was the best and Kung Fu Fighting was playing on my way to get MARRIED YAY YAY YAY!!!!!
And that's why that is my wedding day song.
Happy Anniversary Seth. From this: