To say that music teachers have a language that is transferrable to other content areas doesn't make sense either. What does make sense, is learning language in many more than one content area - our example of a person who did this is Da Vinci.
Language for learning is not dabbling in language rhetoric that makes a neophite sound like a sage. It is getting into the language of a discipline and then recognizing that everything is language for learning. Transfer, well that is important, too, but I'll talk about that in another post.