lucky devil, I've been looking for that for quite some time. Most of those ICP's are really, really, good. I've only got the New Acoustic Swing duo, Mengelberg/Bennink duo, and Lijm by Bennink/Bailey, which I finally acquired recently.
right at this very instant, I'm listening to Nursery Cryme by Genesis. It's been 10 years since the last spin.
Tetterettet has eluded me as well. There's not a clinker among the ICP LPs, though Groupcomposing isn't quite the all-star game one would hope.