Some we had at our wedding that were big hits:
YMCA - The Village People
Paradise by the Dashboard Light - Meatloaf (This one is always a big hit with my family. Girls go to one side and guys to the other then we all sing it to our partners. My husband even slid across the floor at me toward the end during, "Now I'm praying for the end of time..."!!

It was great!)
Friends in Low Places - Garth Brooks (This is our family "anthem"!

)
The Chicken Dance
Hells Bells - AC/DC (we were introduced at our reception with this song!)
Goodnight Irene - I don't remember who sang this. I asked my DJ to find it, because it was my grandparents' 50th anniversary the week after we got married. This was the first song they danced to at their reception.
I know we had a ton of '70's and '80's stuff. Music was a huge part of our wedding and reception. Our DJ gave us a 10 page list of the usual songs she played. We went through and crossed off the ones we didn't like/want and added others that weren't there. She did a great job.
Good luck!!
Michelle