It is one of the most famous songs in the series , and was first sung in " Flop Starz ". A full version of the song appears on the Phineas and Ferb soundtrack as well as on the album Disney Channel Playlist. This extended version is also sung at the end of " Phineas and Ferb Musical Cliptastic Countdown ", in which it was the 1 song. Phineas : Ladies and gentlemen, the Ferbettes! I'm Phineas and this is Ferb and we're gonna sing a song!