Martha Wainwright sings Proserpina — written by her mother Kate McGarrigle.
More information on the myth of Proserpina (from Wikipedia):
Venus, in order to bring love to Pluto, sent her son Amor also known as Cupid to hit Pluto with one of his arrows. Proserpina was in Sicily, at the Pergusa Lake near Enna, where she was playing with some nymphs and collecting flowers, when Pluto came he abducted her in order to marry her and live with her in the underworld of which he was the ruler.
Her mother Ceres, also known as Demeter, the goddess of agriculture or of the Earth, went looking for her in vain to every corner of the earth, but was not able to find anything but a small belt that was floating upon a little lake. In her desperation Ceres angrily stopped the growth of fruits and vegetables. Ceres refused to go back to Mount Olympus and started walking on the Earth, making a desert at every step.
Worried, Jupiter sent Mercury to order Pluto (Jupiter’s brother) to free Proserpina. Pluto obeyed, but before letting her go he made her eat three pomegranate seeds, because those who have eaten the food of the dead could not return to the world of the living. This meant that she would have to live three months of each year with him, and stay the rest with her mother.