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1.
When someone expresses their views and thoughts to the public to the tune of a popular hit tune, with different lyrics.
Here is an example of a wierd Al tune.

Dedicated to my ''friends'' in the music and entertainment industry:
(sung sarcastically to the tune of Abba’s thank you for the music, with a punk rock backing)

Thank you for the madness, the turmoil you’ve been bringing,
Thanks for all the nightmares and singing,
Who can live in this world I ask in all honesty,
What would life be,
Without a home or a job what can I be,
So I say thank you for the madness, for giving it to me.
-Written by ‘Weird’ Al Yankovich
by A Wierd Al April 02, 2011