What Might Have Been

An as-yet-unknown duet between Phineas and Isabella was first mentioned on Twitter and later confirmed in a live Spreecast chat. It is known that this song will be heard in the Season 4 episode "Act Your Age".

Lyrics
What Has Been Seen So Far (Not in Order/Unknown Order)

I found you

We spend so much time together

In every kind of weather

All that's left

The thought of what could have been done

Why couldn’t I see, I should have known,

I should have said,

If I’d only known!

You was always there

You asking me what

I'm doin', ...When I w...

You'll see me

Invited you ...

I ... oh s...

And you ...

A wink.

Then I ...

But for ...

Are ... ...

Background Information

 * Third song to involve Isabella's relationship with Phineas (City of Love, Isabella's Birthday Song).

Production information

 * The song was first seen via Twitter tweets.
 * According to Robert Hughes, the song will feature the word "Phinabella", a popular fan term for the Phineas/Isabella pairing.

Songwriters

 * Robert F. Hughes
 * Dan Povenmire
 * Madison Scheckel