sentences:  David's Web series, "Koga and Family," in collaboration with Philip Kholos, is designed to help young children deal with everyday challenges through martial arts, meditation and kindness.Friedman also wrote two songs for "Barney's Great Adventure", the 1998 film, based the PBS Kids television series "Barney and Friends".In 2006, Friedman worked in the music department for "World Trade Center", a biopic film based on the September 11, 2001 attacks starring Nicolas Cage.