Humming As Communication

It's been said that humming does not communicate, as does actual speech.

I disagree. It may usually communicate nothing, but if I hum the tune to "Amazing Grace" (or the theme from "The Flinstones"), that will put ideas and images and even words into your head.

Granted, that communication is dependent on a shared culture, and so does not communicate new information the way speech is able to do, but humming is not always or entirely void of communicative value.

Just an observation.