EWI is a type of wind controller, an electronic musical instrument invented by Nyle Steiner. The EWI has been used by many artists across many different genres.

An electronic musical instrument or electrophone is a musical instrument that produces sound using electronic circuitry. Such an instrument sounds by outputting an electrical, electronic or digital audio signal that ultimately is plugged into a power amplifier which drives a loudspeaker, creating the sound heard by the performer and listener.