In the late 1800s, fairs were popular. As crowds grew and mechanical rides began to appear, there was a need for louder music. The fairground organ was developed. Eugene DeKleist of North Tonawanda, New York, was an early builder of such organs (also called "barrel organs") for use in carousels. Wurlitzer bought an interest in DeKleist's North Tonawanda Barrel Organ Factory in 1897. In 1909, Wurlitzer bought the entire operation, and he moved all Wurlitzer manufacturing from Ohio to New York. In 1909, the company began making innovative automatic harps that were more durable than European prototypes, and from 1924 to the 1930s, eight models were available. The ""Mighty Wurlitzer""  theatre organ was introduced in late 1910 and became Wurlitzer's most famous product. Wurlitzer theatre organs are installed around the world in theatres, museums, churches and private residences.