My wife and I were at WDW and MK a month ago and were standing in the hub just when the Dans boarded the empty horse trolley.
We ran over and asked if we could ride.
They all said, "Come on in!" and the driver started the trip to Town Square.
My wife and I were the only guests aboard, and were the sole audience as the Dans performed just for us!
We talked with them after the song and discussed their appearance at our Kansas City Barbershop Quartet
concert a year, or so, ago (which we attended.)
Disney fun!