Why does the 'Iroha Song' sing of 'impermanence'?—If you thought it was just a song for learning characters, there was also 'Ametsuchi' before it

Me: Sokra, I am currently turning the 'Iroha ni hoheto' into a song. The trigger was simple.English has the ABC Song. In modern Japan, welearn the fifty sounds by saying, 'Aiueo, Kakikukeko...'So, how ...