Pink Floyd has the famous intentional one on The Wall. If the song Empty Spaces is played backwards, you hear "Congratulations. You've just discovered the secret message. Please send your answer to Old Pink, care of the Funny Farm, Chalfont".
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If after I depart this vale you ever remember me and have thought to please my ghost,
forgive some sinner, and wink your eye at some homely girl.
H.L. Mencken
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