Handsonlycpr.org/symphony The Hands Symphony is an interactive application that uses music to demonstrate just how easy it is to perform Hands-Only CPR. Working collaboratively with a music house, we recorded each clap, slap and snap in a sound studio. Once filmed and looped, the hands were placed in sections, just like a symphony. By clicking on the hands, the user can play around to create the perfect track. They can also share it with friends and help spread the word about Hands-Only CPR.