.... matter of audience, ratings, and a whole lot of other criteria, I would imagine. I could quite gladly sit through 'Later...' and watch him sing one after the other.
Bob Harris, God bless him, tipped his hat to the Trad/Folk audience from time to time, in his day.

Oh.., I commend him for singing that song; considering the breadth of his repertoire. Is it his own?

B.