Pink Floyd's Nick Mason tells the story of Laurens Hammond and the musical legacy of the instrument which bears his name. The Hammond Organ is arguably the first mass-market electronic instrument and in this episode we head to the heart of the Hammond Organ story: Chicago. One of the most familiar and versatile instruments to emerge in the 20th Century, the Hammond Organ’s reach ranges from the gospel of African-American churches, to jazz and reggae, to the swirling sound of progressive rock. The series is produced in association with the Open University.