This is the DRM problem again. However much we might wish that it was not true, ideas are not rivalrous. If you share an idea with another person, they now have that idea too. If you share words on paper, then someone with eyes and a brain might memorize them (or much more likely, just grasp and retain the ideas conveyed in the words). If you let someone hear your music, then the ideas (phrasing, style, melody, etc)…
Let's talk about ownership in a broader sense. In practice, one cannot effectively own (retain possession of) something without some combination of physical capability or coercion (or threat of coercion). Meaning: maintaining ownership of anything (physical or otherwise) often depends on the rule of law.