Three Cantonese and a Double-Bass

Three Cantonese with a double-bass?...fair enough. But who are the Throw Cantonose and the Through Cantonoose? Well, it doesn't matter. Busy people who always lug a heavy double-bass around. Or is it a deeble-bees? Something like that anyway. And people who always carry something around have sinister plans, don't they? But what are they planning? If the police only knew. They watch the three Cantonese in the street and don't know what to do: Now they're piling up some stones, now they're building a wall. Well, what is it now?, the police mutter darkly. No: Wüll, wüt üs üt nüüü?? Or maybe darker still: Woll, wot oz ot noh???. But the three Cantonese don't take them very seriously. And when the great wall is finished they take their double-bass and play a loud tune. And what happens next? The wall collapses, of course, and ... disappears. Just like that.