Who's Who?

Who's Who? is a song sung by Candace, Phineas, Isabella and Irving while they have swapped bodies.

Lyrics
Candace: No way, you’re Irving! I’m not falling for your tricks, I can tell who’s who. You think you can confuse me, but I tell you that you’ll lose!

Irving (Phineas): Candace, you got it wrong. I’m Phineas, not Irving!

Phineas (Isabella): I’m Isabella.

Ferb (Irving): And I would be Irving!

Candace: CUT!