If, someone suggested, the music is proprietary, then the commercial version is probably it. Unless they commissioned or borrowed it from one or another of the groups mentioned here or someone else in which case it wouldn't surprise me if it was tied up in one rights issue or another. I don't think it is a piece of something already released because there are other folks casting around the net looking for the origin and my experience is that there is someone out there who would have recognized it for certain in the past several months. And the group would be pointing at it on their website as well. (As the DW's have done with any of the several songs of theirs that have turned up in commercials or shows.)