While not "personal", this spirit or life-force has a "history" associated with our particular collection of animated matter. It has experienced things with us, while being essentially unchanged by those events. Its movements have created unique fields of influence by the notes or sounds it has generated by our body's mental and physical activities. When the body is too weak to contain it, it leaves. Some goes to other matter, and some joins the ambient background of fields. The unique fields produced by its cleaving to our body, however, remain for a while before dissipating. The stronger the field, or the louder the note, the more time it takes to fade.