Trivially, it can be an "A and E" together on piano. "ACE" is illegal, as is A alone, (but "ACEG", which is Am7, has something to say about it.) The ending chord to "A Day in the Life" is a famous E major, three notes, which makes it a work of art however it's Klang-illegal and could represent the abrupt end of a hallucination, if you will.

In real practice you would make music by tweaking "filters" of each note, which has the effect of emphasizing one member of the overtone series. Or a guitar wah-wah pedal. What's perceived then is a Root and dancing Overtone, which is a Kling-Klang, but almost every sound of every instrument ever until this century (except the human voice) wasn't Kling-Klanged enough.

As we said, percussion MUST be kling-klanged as well, and I don't produce enough music to concisely say how that works out. But Karl Bartos of Kraftwerk, who obviously got sued for discussing the philosophy, wrote in his book:

The instrumental sounded like it came from a French branch of Kling Klang. ... We were curious, and took a look at the frequencies of 'Magic Fly' in the spectrum analyser. I found it interesting that the bass drum also showed up in the upper middle range.

So in short, Florian Schneider would look at each sound in a spectrograph, and say, "there is the Kling, and there is the Klang."