Somebody please tell me I'm not insane

It bothers me for a while now, and every time I ask someone he says he'll give it a listen later but it just never happens.

You see now, except for the opening bassoon Stravinsky said that he didn't use any folk song in his Rite of Spring.

I looked for the original song that drove the inspiration for the bassoon solo and eventually found it somewhere.

Now here's my problem. I'm pretty sure it appears in the Augurs of Spring (6:16)  and in the end of Round Dances of Spring (10:30).

And here it is:

Theme and variations on a folk song! The exact same one! But what's it's name? How can I find a recording of it? 

And why does nobody say anything about it???

As far as I know (I don't know it that's what you are looking for)

For the opening solo, Stravinsky chose
“Tu, manu seséréle” from Anton Juszkiewicz’s
Melodje ludowe litewskie

@Luis Hernández

Thanks! But that's not the problem.

I found this one already.

My question is about the one in both videos.

What folk song is it?

And it's a clear evidence that he used other folk songs although he denied it!

Am I right? Is that the same tune?

I hear the derivation that you speak of ... if I am thinking of the same part of the Stravinsky that you speak of. That is an interesting observation that I had never been aware of.