Beginners can just jam around and that's just fine. Slowly learning what sounds good.
But that is not what you said. " choose 2 chords then find out what key they are in."
My answer was specifically
in response to that. My response was
that's not so easy for a beginner. SPECIFICALLY "find out which key these are in.."
MY REASON : was that beginners can find nice chords which go together which are not in a key at all, because they use borrowed chords. So saying " choose 2 chords then find out what key they are in." is going to require more knowledge.
now you say
...people believing that music theory means you stay in one key (hint: this is not true).
YES, which is EXACTLY THE POINT I MADE IN MY POST.
Exactly what I said . Exactly the reason .Beginners land on complex stuff
beginners can find nice chords which go together which are not in a key at all, because they use borrowed chords from parallel keys
So they will need a bit more knowledge to decipher whats going on. SPECIFICALLY TO
" choose 2 chords then find out what key they are in." is going to require more than intuition.
That is very different from what you are
now saying. Which is "everyone is naturally musical" and so can intuit applicable knowledge . MY POINT was borrowed chords and inversions make that too difficult to complete.
That Bobby McFerrin thing is fatally flawed and I'm amazed people dont spot the logical flaw.
Every human has been exposed to music in common formats such as Nursery rhymes like "Frère Jacques" which bake them in.
When he sings the first 3 notes of the scale he establishes a scale framework we all RECOGNIZE AS FAMILIAR. Its not DNA its repetition.
We just don't realise we have heard that scale as a basic melody for all our lives and he points it out.
He ought to say :"This is a common scale you have all heard over 20,000 times, look how familiar you are with it you can complete the sequence".
It's like completing the sentence "Baby you can drive my ..."
it's not DNA which allows the completion.
it is learning.