STEIM was a center for research and development of new musical instruments in the electronic performing arts, located in Amsterdam, Netherlands. Beginning in the 1970's, STEIM became known as a pioneering center for electronic music, where the specific context of electronic music was always strongly related to the physical and direct actions of a musician. In this tradition, STEIM supported artists in residence such as composers and performers, but also multimedia and video artists, helping them to develop setups which allowed for bespoke improvisation and performance with individually designed technology.

An experimental musical instrument is a musical instrument that modifies or extends an existing instrument or class of instruments, or defines or creates a new class of instrument. Some are created through simple modifications, such as cracked cymbals or metal objects inserted between piano strings in a prepared piano. Some experimental instruments are created from household items like a homemade mute for brass instruments such as bathtub plugs. Other experimental instruments are created from electronic spare parts, or by mixing acoustic instruments with electric components.