The Onkyo music movement or Onkyokei ( (translation: "reverberation of sound" Onky?kei)) is a form of free improvisation, emerging from Japan in the late 1990s. Onky? can be translated as "sound, noise, echo".
The Off Site, a venue in Tokyo, is home to the Onkyo music movement, which is characterized by improvisation, minimalism, and "quiet noise". Onkyo improvisation, "explores the fine-grained textural details of acoustic and electronic sound".
It influenced the development of electroacoustic improvisation, or EAI, a genre with which it is strongly intertwined. The transnational circulation of onkyo also influenced its representation as a form of "Japanese new music," despite claims by its authors that onkyo had little to do with Japanese cultural identity.