Mind blending is telepathy although this story takes to the extravagant extreme just as HER did only she did it with a computer.
telepathy
the supposed communication of thoughts or ideas by means other than the known senses.
I know its definition. And I'm sure that many here do also. But there is no mention of it in Childhoods End. That’s an entirely different storyline. But i do think you would like it, when it says end ,it means it and it’s very sad. After the Alien Overlords had pampered mankind for decades, it was time for a retribution we weren't told about . No more children are born , Only one human was left and he didn't want to be alone. So he wasn't, or the Earth. All that was left was a song where we once were.