he is Romanian, his name is Grigore Lese.

@@Fjord_ Why was he singing in greek then? The song was about Tsaouseskou.

@@kelor He himself I do not think he is singing, vocally I mean. He plays his violin. But given your comment I checked more and as I see he likes music so much and bringing to life old songs, some not Romanian, and this is also acknowledged by the very title of this video here talking about him playing Jewish songs. He was born in northern Romania and I read that in 2007 he met some aromanians in Cogealac/Romania, close to the Black Sea. (In Romania there are minorities.) The aromanian language contains both Greek & Romanian words. But again, it was probably somebody in that group of aromanians met in Cogealac that was singing that song which you say it was "in Greek".

@@Fjord_ Ι see. Thank you. In fact he was not singing, but speaking while playing his violin. I'll find the song and let you know the words, so that you may find it. Aromanians are the wallach?

@@kelor In the past (14th century) one region of nowadays Romania was called by foreigners as the Wallachian principality and as “Tara Romaneasca” by the locals themselves. On the other hand the term “Wallach” is now explained on the internet as meaning “people descending from the latinized population / speaking roman”, and so larger parts of central, eastern & south-eastern Europe can be attributed this term, including aromanians.