...on the contrary, off the top of my head, M., I've sung "Tommy's Gone to Hilo" (E.trad.) and had the pace of the 2nd and 4th lines changed by the group/chorus - yes, most of whom would have attended a lot more folk-clubs than me; it didn't bother me as it was a folk club not a jazz club. And this traditional way of singing verses with, mostly, just the tune (in a manner quite different from what is now called "Pop") is what remained popular, in England, e.g., for centuries; and I like it.