I'm using that to group all the things that are communicated through the musicality of the voice in addition to the words themselves. Like if a person is happy, upset, or surprised, in a way you can pick up from the tone of their voice.

Here's a small example, about how the minor third interval between two notes which is perceived as "sad" in Western music, is also present in English speech that sounds "sad" to the listener: https://www.researchgate.net/publication/44642274_The_Minor_...