That is so funny. I've never heard of them. One of my first jobs was at a Waffle House. They sent us to "school" to learn the correct way to yell orders, but no mention of songs. I used to give the jukebox a workout, too and don't recall WH songs. I never understood why they made us yell...I found it annoying then and still do. If I eat at a place like that now I choose Huddle House. Also, my WH manager one time wanted me to take out an order of bacon to a customer and the bacon wasn't done. He and I had words and I refused to serve my customer improperly cooked bacon just for the sake of speed. He put the bacon back on the grill.
I have a Golden Corral steak story as well. But I digress. Maybe another time. LOL.