The song playing during this fox dance is "The Fox (What Does The Fox Say?)" by Ylvis, released in 2013. It has now been viewed over 1 billion times on YouTube, and was a huge hit around the world at the time. It was also parodied on the popular American TV show "Saturday Night Live," showing just how popular it was at the time.

Ylvis is a duo of Norwegian brother comedians, Vegard and Bird. They are also known as the hosts of the popular Norwegian variety TV show "I kveld med YLVIS", and this song made them an instant hit.

The "Fox Dance" has captivated Japanese baseball fans across time and space. Wouldn't you like to join in and dance along at a Hokkaido Nippon-Ham Fighters home game? For those of you who would like to join in, we've released an official choreography video! The players also seem to enjoy dancing along.