Nicholas Hammond is an American actor. He played Friedrich von Trapp in the classic musical film The Sound of Music alongside Julie Andrews and Christopher Plummer, and also appeared on the film's soundtrack. Hammond's other film credits include Spider-Man Strikes Back, Ladies in Black, Turkey Shoot, and Art of Eight Limbs. He has also appeared in television series such as The Brady Bunch and Fields of Fire. Hammond released the popular song Please Don't Switch Off the Moon - The Lost Pye 45.