In the very first themmAngu thread I had outlined some characteristics to designate a song as themmAngu. In a few of the early threads this point came up again and again and got refined, contested, and expanded.
I just came up with some criteria that made sense to me, based on my reading up on folk songs and their origin. None of this is set in stone. If you don't consider a song as themmAngu, just say it with or without proof and it will get added to everyone's views on the subject.
This is just an informal attempt at looking at certain songs that have a certain flavor to them in a new context. By no means is this a definitive delineation of themmAngu or its part in TFM.