Why is swing low sung in rugby?

Rugby players and their supports originated in the small village/towns where each week the match took place and the after match meal, which normally included the odd alcoholic beverage was all about enjoying and socialising. as whole. Teams would not have large entertainment but would entertain themselves with songs, inevitably the songs would be well know but Words would be changed frequently having funny and or adult content. To make some songs even funnier hand actions would be added - This proved to be a main stay of the after match get together with bawdy songs, silly games and the odd challange thrown in all in the name of sport (and if you believe that you you believe anything). As teams travelled so the songs travelled as well. Swing Low is an English favourite whilst Tom Jones's Delila is a Welsh favourite and many more.