from http://en.wikipedia.org/wiki/Heal_the_World

In a 2001 Internet chat with fans, Jackson said "Heal the World" is the song he is most proud to have created. He also created the Heal the World Foundation, a charitable organization which was designed to improve the lives of children. The organization was also meant to teach children how to help others. This concept of 'betterment for all' would become a centerpiece for the Dangerous World Tour. In the documentary Living with Michael Jackson, Jackson said he created the song in his "Giving Tree" at the Neverland Ranch.