The Ballet Pig is a rival to Gil. He always shows up when Gil doesn't want him to, and interrupts his songs. He appeared in the The Farmer's Song, and he has a line in Our Great Play.
Ballet Pig first appeared in Our Great Play He had singing line, it was "Ballet is one of my favourite things". And he made a second appearance in The Farmers Song. He sangGil's line which got him frustrated.
Video of Ballet Pig
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