New York City kids pump up the volume, using a decibel meter to monitor the surprising and sometimes dangerous sounds in their favorite urban hang-outs. * Julian and Sabrina "go to the dogs," creating sound spectrum snapshots of prairie dog barks to explore animal communication. * Kyla and her team of musical mix-masters scratch out the science of hip-hop. * Scientist Joseph Pompei pinpoints sound with his "Audio Spotlight." * And DragonflyTV asks: how can you create the sound of 1,000 marching people?