The orchestra used various electronic instruments, such as theremins, electronic organs and early synthesisers. Electronic instruments such as guitars, bass guitars, theremins, and synthesizers are also allowed. However, he has also used theremins, synthesizers and harmonicas in his side projects. The displays include rare theremins, prototype synthesizer modules, and Moog's documents. By 1963, Moog had been designing and selling theremins for several years.