Although Hennessy was unable to read or write due to severe dyslexia he still wrote his own songs such as "Roll back the Clouds" and "All the lies that you told me", he sung All the lies that you told me with his daughter Hermoine, but the song was made famous by Frances Black rather than Hennessy and his daughter.
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A renowned songwriter as well as performer, Hennessy wrote several songs that became hits for other singers including Don't Forget your Shovel, made famous by Christy Moore, and All the Lies that You Told Me, recorded by Frances Black.
He then devoted himself to production work with both Mary Black and her sister Frances Black.
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