Although the Voca People claim to be aliens from another planet—Planet Voca— where the main method of communication is sounds, they are actually an Israeli-based performing theatre, combining a cappella and beat box vocals to reproduce the sounds of an entire orchestra. They've performed in Spain, New York, Hungary, Italy, France, England, Israel and many other places. They incorporate the public into their songs and change or add bits depending on which country they are in.
Their repertoire includes classical music, jazz, rock 'n' roll, Hollywood soundtracks and some greatest hits.
See more at http://voca-people.com