I Believe We Can

I Believe We Can is a song performed in Phineas and Ferb: Summer Belongs To You! by Clay Aiken with backing vocals by Chaka Khan, acting as musical "stunt doubles" for Phineas and Ferb.

Lyrics
Lyrics in parentheses are background vocals sung by Chaka Khan

Clay Aiken: What is a summer really

But a tepid month or three?

Ferb: Clay Aiken?

Phineas: ''Yeah. I hired a stunt singer, what do you think?''

Clay Aiken: If you agree with Buford

That's all it will ever be

And we don't need to break the laws of physics

To make a day that's longer than a day

We can follow that old sun 'round the circumference of the globe

And stop all the naysayers from naysay...ing

'Cause I believe we can

And that's the measure, the measure of a man

It may sound far-fetched, this thing we've got planned

But I believe we can

I believe we can (Ooh, I believe, I believe we can)

And that's the measure, the measure of a man (Oh, that's the measure of a man)

Phineas ''(to Ferb): Chaka Khan. Nice.''

We'll make it back here (We'll make it back here) to where we began...(Oh...)

Phineas: Or at least that's the plan!

Chaka Khan: Of course, first you're gonna have to fix this wing, yeah! Hey where's Perry?

Background information

 * On the soundtrack album, the line "or at least that's the plan" is sung by Clay Aiken.
 * Goof: When Clay Aiken sings "And that's the measure, the measure of a man," Ferb's bigger eye is in front of his little eye.