 "Phineas and Ferb" follows structural conventions Povenmire and Marsh developed while writing "Rocko's Modern Life", whereby each episode features "a song or a musical number, plus a big action/chase scene".Both creators had musical backgrounds, as Povenmire performed rock and roll in his college years and Marsh's grandfather was the bandleader Les Brown.The creators' original pitch to Disney emphasized Perry's signature "secret agent theme" and the song "Gitchee Gitchee Goo" from "Flop Starz".