MERA MAGIOU
Mera Magioú (A Day in May), lyrics by Yannis Ritsos, music by Mikis Theodorakis. Here is a recording.

Liner notes to the CD, From Greece With Love, give the lyrics, in English translation, as

You went away on a day in May, my son;
I lost you in the Spring which you loved so much.
You went up onto the terrace
And greedily drank the daylight with your eyes.
You told me about the great world
In your sweet, manly voice,
And you promised me that one day
It would belong to both of us.
But now you have been extinguished,
And my light has been extinguished, too.