A modular approach to large string array electronic musical instruments such as specialized harps, zithers, sympathetic string arrays, the Harry Partch Kithara, the Harry Partch Harmonic Cannon, and other large string array electronic musical instruments is presented.A mounting frame is used to interchangeably secure a plurality of a plurality of musical instrument modules, each comprising a plurality of strings configured to vibrate and create electronic signals. An electronic interface is configured to transmit electrical signals from the plurality of musical instrument modules to an external system. The electronic interface can be configured to provide a multichannel output. The arrangement can further comprise either or both of at least one audio mixer and at least one signal processor.