Well, I'm eminently qualified to comment here since lots of people have told me that I talk too much between songs...(and I dont' perform very often!)So I try to be brief, just long enough to set a context for the number, perhaps a thumbnail sketch of the plotline to help focus peoples' attention.
But some people have a lot to say about their music--Dick Gaughan comes to mind. He seems to go on in a didactic fashion about Scottish politics and psyche and so on, but what the hell, its what you have to expect, concert performers are not just ambulatory jukeboxes. If you didn't know when you bought your ticket that you were attending a musical political rally, well, you know a lot more on the way out than the chorus to "Loch Lomond".
As for Billy Connelly, well he's a comedian ain't he? you can only expect him to tell a lot of jokes.
Willie-O