In the original post the singing is being done by the person watching the woman doing her ironing (she doesn't seem to be doing anyone else's ironing, and the singer seems to have nothing better to do).

Years ago - many, many years ago - I used to listen to Ivor Cutler on 'Monday Night at Home', on the Home Service, while ironing. Nowadays I hardly ever do ironing and 'Monday Night at Home' is a distant memory. However, if I ever do any dressmaking again the iron will be used at every stage.