This item is not in the library — it is a part of: C. Cardew (ed.), Nature Study Notes (full, 1969).
The important thing is of course to play anything but do not attempt to play any melody and then not necessarily. After a certain amount of time, try to "tune in" to someone else's improvisation. As soon as you suspect that someone is tuning in to your improvisation — try to shake them off.
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