It became too expensive to produce and electronic organ sales declined. This is a list of electronic organ makers. Deng started learning using electronic organ by age six. He became a piano tuner and electronic organ serviceman. Harold Smart was at the electronic organ. Jordan's band also pioneered the use of the electronic organ. He began taking lessons on the electronic organ from the age of five. Bozak joined C.G. Conn in 1944 to help them develop an electronic organ. The electronic organ developed throughout the 20th century. The post-chorus instrumentation includes electronic organ. The album is characterized by slower tempos and use of electronic organ and piano-driven melody. Terada majored in computer science and electronic organ at the University of Electro-Communications. Peterson played electronic organ behind Staples' singing. Vangelis plays synthesizer, sequencers, electric piano, electronic organ, harmonica, brass, timpani, percussion. Besides piano, Rohani mastered the electronic organ and accordion.