Answer the following Q with stream of consciousness. Things Ai n't What They Used to Be is a 1942 jazz standard with music by Mercer Ellington and lyrics by Ted Persons.\n\nAnswer this question based on the passage: who wrote things ain't what they used to be?
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To answer the above question, the relevant sentence is: "Things Ai n't What They Used to Be" is a 1942 jazz standard with music by Mercer Ellington and lyrics by Ted Persons. Therefore, the final answer is music by Mercer Ellington and lyrics by Ted Persons.
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