Well...it is like this...
Let us go back to the recital given by the children, and the different views of the parents and the teacher.
They are very different and I will proceed to explain why.
We are going to explore the concept of an audience within an audience ( this incidentally is one reason why many members do not always grab what I deeply mean in many of my posts).
You may recall a post I made about the performance of magic by a magician for different audiences...for an audience of children, for an audience of adults, and for an audience of fellow magicians..
Let us transpose this to music.
I play classical guitar. When I listen to a recording of a peice in my repertoire played by another guitarist, be it Williams, Segovia, Parkening, Boyd, Bellucci, Yepes, Li, or whoever, quite apart from the technical aspects, ( what instrument, what strings, etc.,) my attention focuses to a deeper extent than that of an audience of lovers of classical guitar because in effect what happens is that I live it. Every note and its colour, tone, volume and duration for me has special meaning as I am able to identify in a very deep sense and harmonise, in effect, sort "of living it". This is very differernt to listening and enjoying.
This takes me to the Socratic dialogue you posted as a pdf that has gone unnoticed.
In this discussion between Socrates 400 BC and Ion, the discussion has structure, in which there is a very important and valuable lesson I will bring to your notice, in the event you have overlooked it.
Socrates commences by establishing that Ion has memorised his performances and is able to recall.
But this in itself is not enough.
He now leads Ion into a discussion, of whose purpose Ion is unaware.
To the casual observer, it appears to be a rambling, endless, meandering, inquisitive pointless serial questioning and answering session.
Not so.
I am being called, sorry, later...