Gitchee, Gitchee, Goo

Gitchee, Gitchee, Goo is probably the most well known Phineas and Ferb song. It came first in the Cliptastic Countdown episode, in which the extended version was shown for the first time.

The original, shorter version was first performed at the Googolplex Mall, during the episode "Flop Starz", season one. It was the first song, and the one that started the existence of all the following songs.