Demi Lovato teams up with DoSomething.org and teens who want to make a difference. She sings some songs off her record in this special Cambio Cares concert. This is an effort to get teens to Join the Surge a massive movement of teens wanting to make a difference. Check out her stories—along with the teens who wrote letters—about Chile and sending letters to the people who were affected by the earthquake. Demi delivered the letters from New York and Indiana herself. You go, girl!