when we head downstream , i find that there is a paddling song in which all the girls join and to which i try to add my voice , mainly in wordless harmony , and then when we pull into the marshes where the food grows , they fall into what i know are call-and-response songs-songs wherein one voice calls out a verse , mainly concerning another member of the party , like , say , what particular boy one particular girl has her eye on , and there are hoots of laughter and that particular girl gets to pick another girl or boy or whatever to comment on , and so on and so on .