What We're Gonna Do is the first song of "Phintastic Ferbulousd Musical". Phineas: I know what we're gonna do! We've done alot of stuff, it's true! I just want to share with you, My idea for something that's brand new! We built robot clones, And a biodome! We built shoes to go as fast as sound! When our classmates hear everything we've done, We'll be the coolest guys in town! We'll be the kings of fun! Come on everyone! Phineas and Background Dancers: We can make a musical! We've already done it all! It's time for something new, This is what we can do! We'll make a musical! Are you thinking what I'm thinking?