Song: Aren't You A Little Young To Build A Rollercoaster?
By: a rollercoaster engineer and Phineas Flynn
Episode: Rollercoaster: The Musical
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Phineas and Ferb build a tree house and remodel Candace's old one. Later, they get in a Tree House Fight against Candace and Stacy. Meanwhile, Perry tries to stop Dr. Doofenshmirtz from getting revenge on his brother Roger.
