When the poet Thomas Moore's young wife was stricken with an illness she worried that she would lose her looks. So Moore wrote the words to this song to reassure her that how she looked did not matter to him, that he would love her always. His words are a bit poetic and old fashioned so I put a simple explanation at the bottom of the page. The tune is a traditional Irish air.
Free piano sheet music for "Believe Me If All ThoseEndearing Young Charms"