The song is titled The pain of Heracles (Ο πόνος του Ηρακλή) with music and lyrics by Labis Xylouris (Λάμπης Ξυλούρης): https://www.youtube.com/watch?v=ihgAP5dAKEc. Therein lies the insight that the seemingly invincible Heracles is, in fact, movable, fragile, breakable, human. Heracles is breakable because all humans are.