Blueprints

This song is in the episode "Phineas and Ferb Interrupted" by Baljeet, Buford, Candace, Heinz Doofenshmirtz and Isabella so Phineas and Ferb can get their personality back. It was seen in the promo.

Lyrics
Baljeet: With these blueprints we can make a mighty tower,

Isabella: With these blueprints we can mold a chocolate ball! Buford: With these blueprints we can forge enormous yo-yos,

Baljeet, Buford, Candace, Isabella: With these prints we can build anything at all!

Doofenshmirtz: We got blueprints, glorious blueprints!

They give us endless potentialities!

We could build an android porcupine,

Bionic hearts for Valentines,

or giant dogs with artificial fleas!

Candace: 'Cause we've got blueprints!

Baljeet, Buford, Candace, Isabella: Glorious blueprints!

Doofenshmirtz: They make the things we dream reality

Baljeet, Buford, Candace, Isabella: We can build jet powered water wings,

a catapult with matress springs,

and practically anything you see!

Baljeet, Buford, Candace, Isabella, Doofenshmirtz: We've got one prints,

two prints,

nothing we can't do prints!

Three prints, four prints,

everyday it's more prints!

Five prints, six prints,

nothing we can't fix prints!

Big prints, small prints,

make anything at all prints!

There's nothing we can't do,

as long as they're blue!

So get some hammers and nails,

and buckets and pails!

So grab a two-by-four,

'Cause we've got blueprints galore!

We've got a lot of work to do!

Baljeet: With these prints that are blue!

Note

 * This is one of the very few songs that have the characters from both plots singing the same song, the other being "Busted".
 * First time in the the 3rd season of Phineas and Ferb that Isabella has a solo line.