When I was shown this video not only did the dancing look fantastic but the music they were dancing to was really good.
The video has racked up close to 3 million views and is from the 2013 National Shag Dancing Championship in South Carolina. I kid you not (link) :

"The Carolina shag is a partner dance. The shag is a recognized dance in modern national and international dance competitions and became the official state dance of South Carolina in 1984".

Obviously here in Britain hearing the word 'shag' conjures up a couples activity of a very different kind. Watch here partners Sam West & Leslie Melton Jennings [who took 1st place in the competition] despite rubber legs Sam losing a shoe mid dance. 
On to the music, and this is where things got more interesting. 
Bill Pinkney was a part of The Drifters from 1953. When the group's manager fired all the members in 1958 and hired new singers under The Drifters name, Bill Pinkney created a group called the Original Drifters. They have been popular throughout the southeastern US for decades and their music's been a staple of the 'beach music scene'. 

Tracking the origins of the song ‘Gonna Move Across the River’ proved a bit difficult as it sounds older than the 1997 release date I eventually came up with. It's a great track - so any excuse to boogie, maybe not as well as Sam & Leslie, but kick off your shoes if you wish, it's Christmas !

Bill Pinkney & the Original Drifters >