Improvising Orchestras and Large Ensembles by Founding Date
- Globe Unity Orchestra () <<en.wikipedia.org/wiki/Globe_Unity_Orchestra>> (1966)
- ICP Orchestra – Instant Composers Pool Orchestra (London, England) <<www.icporchestra.com>> (1967)
- Scratch Orchestra <<en.wikipedia.org/wiki/Scratch_Orchestra>> (1969)
- Willem Breuker Kollektief (Amsterdam, Netherlands) <<wbk.home.xs4all.nl/blurb.html>> (1974)
- Community Orchestra for Research and Development – C.O.R.D. Orchestra (Vancouver, British Columbia) <<>> (Late 1970s)
- Now Orchestra (Vancouver, British Columbia) <<www.nowsociety.org/about/history>> (1987)
- Vienna Improvisers Orchestra (Vienna, Austria) <<m.fischer.wuk.at>> (1995)
- London Improvisers Orchestra (London, England) <<www.londonimprovisersorchestra.co.uk>> (1997)
- Burnt Sugar the Arkestra Chamber (New York, NY) <<burntsugarindex.com>> (1999)
- Glasgow Improvisers Orchestra (Glasgow, Scotland) <<glasgowimprovisersorchestra.com>> (2002)
- Orkestra Futura (Vancouver, British Columbia) <<nowsociety.org/ofnow-orkestra-futura>> <<www.facebook.com/pages/Orkestra-Futura/106682759406505>> (2008)
- Berlin Improvisers Orchestra (Berlin, Germany) <<berlinimprovisersorchestra.wordpress.com>> (2010)
- Toronto Improvisors Orchestra (Toronto, Canada) <<www.arraymusic.com/toronto-improvisors-orchestra>> (2010)
- The Great Lakes Improvising Orchestra (Milwaukee, WI) <<soundcloud.com/user8086246>> (2011)
- Tokyo Improvisers Orchestra (Tokyo, Japan) <<the-tokyo-improvisers-orchestra.tumblr.com>> (2013)?
- Dreamland Improvisation Company (Louisville, KY) <<www.facebook.com/events/1526553027557102>> (2014)
Unknown Founding Dates
- Of:NOW (Vancouver, British Columbia)
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