Isabella, Adyson, and Gretchen: (While Phineas is speaking) Bum Bum, Bum Bum, Bum Bum, Bum Bum
Phineas: Its summer and winter together. It's S'Winter!
Isabella, Adyson, and Gretchen: Well, there's snow on the ground
And sleigh bells all around
But the sun's beating down
'Cause it's... S'Winter (Ba Dum).
It's ski and snowball-fight time
And also fly a kite time
Cold and sunny
Yes, that's right, I'm talking about S'Winter.
It's a S'Winterous Wonderland
Unusual and grand
You can freeze while you get tanned
Because it's S'Winter (Bum Bum, Bum Bum)
Talkin' about S'Winter (Bum Bum, Bum Bum)
It's so S'Winter (Bum Bum, Bum Bum)
Stacy is seen in the song.
Adyson and Gretchen pop out, and disappear quickly behind Isabella in the last verse of the song. This happens every time they vocalize "Bum-Bum!" as Isabella passionately sings the final verses of the song.