Another one of those that belong in even Britney Spears' and her fans collection.

Some more, including a few extra triple secret groups.
Vienna Art Orchestra - The Minimalism of Erik Satie
London Jazz Composers Orchestra
Barry Guy's New Orchestra - only one recording, but what a recording - Inscape/Tableaux
Spontaneous Music Ensemble
Itallian Instabile Orchestra - beside their own recordings, check out the recording as sidemen to Cecil Taylor - The Owner of the River Bank
Globe Unity Orchestra
Berlin Contemporary Jazz Orchestra
M.I.M.E.O. (Music in Movement Electronic Orchestra)
AMM
ICP
London Improvisers Orchestra
Chris Burn's Ensemble
Moscow Composers Orchestra
Micro-East Collective - not sure if they are considered European.
New Orchestra Workshop - they are Canadian, but there recording with Barry Guy is a excellent one - Study-Witch Gong Game II/10. It's found under Guy's name.
Many of the musicians are members of several of these groups. You can stay very busy just with all the sidemen involved in all of these groups.
Did I mention that In Holland is DA BOMB!?

