Ho, first off, a huge thanks to you for checking out his loop :). The singer is singing about a very green forest, whin in lithuanian folk usually represents a home, a town etc. That is because when the Red Army took over Lithuania a lot of lithuanian solders were hiding in the forests and basically living there. If you want, you can find the full song name is Rasa Sierra - Oi, giria, giria
on Lithuanian singing vocal loop by sydekhd