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I always just considered it idle jamming, which invariably happens in every band's practice room until the lead singer starts whining...
Technically, yes. Well... just as long as the members aren't completely falling back on any specific timbres, rhythms, etc that are associated with other genres, then yea... But... often times free improvisation requires a lot of thought and attention enable to make a decent recording or live performance. If you're unable to do this, then the music will end up being dull and repetitive.
I also meant to ask why is it that Group Ongaku never receive the credit they deserve for helping create free improvisation. Frequently, I encounter people citing aleatoric compositions (music centered around chance operations) and free jazz as being the predecessors to the genre even though Group Ongaku were making free improvisational music around the time when free jazz's inception. As far as documented music is concerned... they invented free improvisation.