Mind you, I only played a few of these when I did a sorrirty semi-formal, but my list of slow songs I had picked out was:
Total Elipse of the Heart – Bonnie Tyler
U got it bad – Usher
Nice and Slow – Usher
Wonderful Tonight – Eric Clapton
Crazy Love – Michael Buble
She is love – parachute
Wanted – Hunter Hayes
Lucky – Jason Mraz
Free – Zac Brown Band
Can you feel the love tonight- Elton john
If you only need a couple those should work. Read your crowd, see what they’re into, just make sure to bump a banging song right afterwards. I went with a redrum of Taylor Swifts “We are never getting back together”. Make sure if you kill the energy on purpose for some slow songs, that you have the ability to bring it right back up with a banger.