Conversation so far:
What role did Dan Povenmire play in Phineas and Ferb?
Co-creator
Was Dan Povenmire a writer or illustrator on the show Phineas and Ferb?
Dan Povenmire is the co-creator of the Disney animated series Phineas and Ferb.
What was Dan Povenmire's role on the show Phineas and Ferb?
Dan Povenmire is the co-creator.
How else was Dan Povenmire involved in the show Phineas and Ferb?
Dan Povemire also voiced the character Heinz Doofenshmirtz.
Was there anything special in particular on any of the episodes of Phineas and Ferb?
Dan Povenmire described the songs as his and Marsh's jab at immortality“.

Question: What else was special about the song?
Self-contained rewrite: What else was special about the songs in Phineas and Ferb?