Why are we doing Tolkien DNA testing?

Source: Wikimedia Commons

There are quotes from Tolkien that show his dream to know the prehistoric roots of his male lineage. Today we make this dream come true by researching the Tolkien Y-DNA

 J. R. R. Tolkien's "The Lost Road" (a fragment of The History of Middle-earth, V):

I wonder what kind of people lived in Portugal and Spain and Ireland and Britain in old days, very old days, before the Romans, or the Carthaginians. Before anybody else. I wonder what the man thought who was the first to see the western sea.' (...)

And after all, language goes back by a continuous tradition into the past, just as much as the other two. I often think that if you knew the living faces of any man's ancestors, a long way back, you might find some queer things. You might find that he got his nose quite clearly from, say, his mother's great-grandfather; and yet that something about his nose, its expression or its set or whatever you like to call it, really came down from much further back, from, say, his father's great-great-great-grandfather or greater.

Anyway I like to go back - and not with race only, or culture only, or language; but with all three. I wish I could go back with the three that are mixed in us, father; just the plain Errols, with a little house in Cornwall in the summer. I wonder what one would see.'

'It depends how far you went back,' said the elder Errol. 'If you went back beyond the Ice-ages, I imagine you would find nothing in these parts; or at any rate a pretty beastly and uncomely race, and a tooth-and-nail culture, and a disgusting language with no echoes for you, unless those of food-noises.'

About Audoin and Alboin Errol from The Lost Road Christopher Tolkien wrote in his commentary: 

Alboin's biography sketched in these chapters is in many respects closely modelled on my father's own life - though Alboin was not an orphan, and my father was not a widower. Dates pencilled on the covering page of the manuscript reinforce the strongly biographical element: Alboin was born on February 4, (1891 >) 1890, two years earlier than my father. Audoin was born in September 1918. 

Thanks to the research that is still ongoing, we already know this (see below). And I think Professor Tolkien himself would be very interested in this research process of the male lineage of his ancestors (English < Germans < Prussians < Balts < Proto-Balto-Slavs < Proto-Indo-Europeans < etc. < Y-DNA "Adam"). I am very thankful to his cousins who share the same Y-DNA with Professor Tolkien.

According to the STRs of two Tolkiens we may predict
that the final result will show R1a-YP270 or its descendants (eg. YP350)

We will probably wait until summer for the results in FamilyTreeDNA: