Last verse can also repeat first, but with slight variation to remind of developments in the narrative: an eg from way I sing it -- first verse, "He courted Rosie Anderson, A lady into Perth"; last verse, "He's married Rosie Anderson..."

& last verse of Butter&Cheese&All ~~ "So now you called on me for a song, & I've showed what I could do, & now that I have finished it..."

~M~