Yeah! We did several system maps over the previous years in therapy. They were always revealing.
Now we don't do a map, but we have movable objects that represent each one of us (that we are connected with, at least - we have lost contact with many that are still active as evidenced by lost time). We like th movable objects more because - well, they can move. So we can explore relationships and connections between them. It works well for our current purposes.
But yeah, i reckon maps a re a good tool. I like your idea on incorporating music. Would love to hear more about it as it evolves, if you're willing!