Mermaid's Song
Song
Go and catch a falling star,
Get with child a mandrake root,
Tell me where all past years are,
Or who cleft the devil’s foot,
Teach me to hear mermaids singing,
Or to keep off envy’s stinging,
And find
What wind
Serves to advance an honest mind.
~John Donne, 1613
Check out the rest of the poem, and a brief analysis at Interesting Literature. If you've heard bits of this without knowing the rest, it will make much more sense.