I made a mistake when I wrote (above) 'We found that if the accompanists played a D chord while the melody instruments played the C notes, then that was all the ninism you'd ever want.'

That 'C' should have been an 'E.'

Glad you like my word 'ninism,' PoppaGator. It is, of course, a neologism based on 'sevenism,' which is the use of chords with sevenths in them.
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weelittledrummer, I think you are thinking of M1.

The other D9, the D9 Caterpillar, isn't musical at all.