Phineas and Ferb - What'cha Doin'?

Isabella: I'm just the curious girl 'cross the way
Every day I come over, and here's what I say

What'cha doin', what'cha doin'?
What's the day's activity?
What'cha doin', what'cha doin'?
By any chance, could it include me?

What'cha doin'? What'cha doin'?
Fireside Girls: (What'cha doin'?)
Isabella and Fireside Girls: I don't mean to disturb
Isabella: What'cha doin', what'cha doin'?
Fireside Girls: (What'cha doin'?)
Isabella and Fireside Girls: You know it's not really directed at Ferb
When I say-ay-ay-ay-ay
What'cha doin'?

Isabella: Oh, don't you know, Phineas, you have no idea
That every day I'm just dyin' to see ya?
And say...

Isabella: What'cha doin', what'cha doin'?
Fireside Girls: (What'cha doin'?)
Isabella and Fireside Girls: I really wanna know
Isabella: What'cha doin', what'cha doin'?
Fireside Girls: (What'cha doin'?)
Isabella: Can I be part of the show?
Isabella and Fireside Girls: When I say-ay-ay-ay-ay
What'cha doin'?