Monologue is the term mostly used to describe the spoken songs. I remember Gracie Field's record of 'We've got to keep up with the Joness' It starts with speech then the chorus is sung.

I also remember the 'Talking Union Blues' recording.

Many of these things are performed by speech or singing in order to give something 'good' to them. Also some are spoken when the voice will not sing good enough. I used to perform 'Brahn Boots' as a monologue but my accompaniest suggested singing the last three words. It was a good suggestion.

Frederick