Midas, YOU ARE GENIUS!!! Yes, this is the song! Jesus Christ, how did you find it?! I have asked so many people, I have looked in so many sites - nothing. You should be proud and you call yourself "The retro music inspector"

No kidding! You are amazing!!! Thanks you so much!
I looked in some sites and surprisingly found Karthago is a hungarian band. Considering Hungary (like Bulgaria where I am from) was a communist country back in 1983 (when the song was composed) I am not astonished English and American people whom I played this track were totally unfamiliar with it saying: "Sorry, we have never listened to this song! Are you sure this is an english or an american band?" We were living in closed world at this time, it was forbidden to listen western music, to sing in the language of the "bad capitalist" countries ... bla-bla-bla. I think you understand what I am talking about. Anyway, enough talking!
"Requiem" by Karthago! Check it out! You won't be sorry! This is a real masterpiece!