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One-trick pony

Posted by Marian on February 26, 2002

An acquaintance who wrote a finale song for a college musical last year, and had hoped to get several new numbers she's now written approved for this year's musical, has failed to gain approval for anything other than another finale number. She's not as pleased as she was last year, partly because she fears she'll be labeled as a "one-trick pony." What's the origin of the phrase?