No, I spelled it the way I need to spell it, MEMBRAIN. I may not have been as clear or explicit as I would have liked below (and you may not feel the need to scroll down through all of this) so let me be so now. If it is in the mind, it got there through the brain. What we are conscious of or our subjective domain or what some call our interiority is created and maintained by the MEMBRAIN.
The MEMBRAIN, like all membranes so important to life, keeps the inside in and the outside out and then selectively passes energy and material in and out. Like Dr. Who’s TARDIS, the MEMBRAIN’S interior is larger than its exterior, a lovely feature perhaps in order to mirror the universe in which we live and learn and imagine. Counter to what most consider goes into the mind, even though our consciousness seems dominated by perceptual stimuli from outside our body and its brain, our interior is also filled with energy (read information) from within our body and brain. But again, if it is in our mind, it came through the MEMBRAIN, and if it comes out of our mind through behavior, including especially symbolic expression, it came out through the MEMBRAIN. Specialized channels for language and art forms, e.g. music, have evolved for the human MEMBRAIN, and when such symbols come to be shared in a socialized reality, we have culture.
That said, let’s look at how conversation and music have changed culturally. One of the conversational maxims articulated by H. P. Grice back in the 1960s was that conversation must be informative.
Seems like a basic feature, but some people and some cultures consider the information they hold within as private and personal property, not to be shared lightly, analogous to some people in some cultures disliking having their photograph taken. It steals their image and is not proper. So in some cultures or in diplomatic circles or poker games, conversations are not as informative or straightforward as they could be. One virtue of science, then, is the effort to convey information with transparency so that others may judge the full truth of the matter. The point here is that we control the permeability of the MEMBRAIN.
I have recently finished reading This is Your Brain on Music by Daniel Levitin, an interesting and informative book (more later on some interesting points and also my quibbles with it). He points out, as others like Angelique Kidjo have done, that music originally was, and in many cultures and moments still is, participatory. The performer-audience gig did not arise until a few hundred years ago after many millennia of music making. (Levitin points out that bone flutes are some of the earliest artifacts of Homo). This frames early music as a sort of simultaneous conversation, everyone listening and playing at once or in a call-response/verse-chorus form. Just listening without participating was a rather prominent cultural change and the MEMBRAIN functions differently, letting energy in and keeping energy in rather than expressing it outwardly.
As an final aside here, when I began working with preschoolers as a speech-language pathologist, I observed many story time circles (or singing circles etc.). Children have learned language through conversation (you listen and respond in ongoing and rapid fashion) and have then to learn how to listen audience fashion as the teacher reads a book, a basic attention span skill for our systems of education. More recently I saw a video of a Buddhist school in which the students all shouted and talked at once as they debated fine points of their teachings, quite a different model for educational discourse. All acquiring MEMBRAIN skills for sustaining our interiority.