he puts on bill haley and the comets and we all exchange looks of surprise and delight , how many years since we heard this , but so irresistible , it pulls us out onto the lawn , the grass dry and coarse under our bare feet , shoes kicked free , as we follow rubys lead , his bellow of great , bloody great , as he throws himself into the music , mouthing the words , sweating profusely as he rocks around the clock .