Found the lyrics, not sure of the tune.

Mermaid Death Song
She'll drag you down, into the deep,
Your children will mourn and your lovers will weep.
Pray while you can, sing your last song,
Life as you know it is over and done.
(Chorus)
Her voice is like wine, her song is a play,
she'll tell you the story of your dying day.
Body divine you cant look away,
Her eyes call you to her while hollow and grey.
(Chorus)
Your body will shatter, like a ship on the rocks,
Your soul she will keep inside her treasure box.
Hers you are now, till the end of time,
She'll feast off your lust like a drunk off the vine.
---(Chorus)---
It's time to go sailing away boys,
Time to go sailing out into the sea,
Its time to go sailing away boys,
Revel your young life while you are still free.

Cheers,

Quokka