Conversation so far:
What role did Povenmire play in Phineas and Ferb?
In 1993, Povenmire and Marsh conceived the series Phineas and Ferb, based on their similar experiences of childhood summers spent outdoors.
Was he a writer or illustrator on the show?
CANNOTANSWER.
What was his role on the show?
Povenmire then mixed and dubbed to produce action and vocals.
How else was he involved in the show?
Povenmire and Marsh wanted to incorporate into Phineas and Ferb the kind of humor they had developed in their work on Rocko's Modern Life.
Was there anything special in particular on any of the episodes?
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 Dan Povenmire's songs on Phineas and Ferb besides being a "jab at immortality?"