"I bought a retail A9home from CJE at wakefield. I did not have to *sing* an NDA."
It is very uncommon to expect buyers to *sing* an NDA and such a requirement would probably have deterred quite a few people. Ad6 apparently forgot to have music scores ready anyway - the question is whether they would have had different versions for base and tenor singers (not to mention female voices). Besides, Alan (Liquid Silicon) was probably too busy to be able to accompany each A9Home buyer on his MIDI keyboard.