Many traditions teach of a "spirit song." I've often found myself humming certain tunes when invoking specific powers (the one that comes when I rock my new "niece" and soothe her has a lot of sharp notes, and sounds rather sad, but affects us both strongly in a positive way). Not to mention the Xian sectors that speak in tongues. The primal/ancestral brain works on such an intimate level and invokes very powerful energy! Think of a drumbeat. Think, also, of how deeply birdsong affects us, or the chirping of crickets. I'm listening to the dishwasher, and even that has rhythm, song. The flow of the universe is in song and I think you are tapping into that when you start humming.
On an energetic level, when you do this, your hara is in alignment and your tan-tien is 'activated,' so to speak. (When you tap into that level of the field, you hear a low vibrating hum, and beyond that the heartbeat of the earth.) Very beautiful!
Crazy Healer Lady
Health and happiness to you!
The purpose of a relationship is not to have another who might complete you, but to have another with whom you might share your completeness. -CWG