Phineas and Ferb - What Might Have Been Lyrics

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"What Might Have Been" is a duet between Phineas and Isabella in the Season 4 episode "Act Your Age". As Isabella sadly moved on with Phineas and leaves for college, while Phineas sadly goes home for not able to see Isabella and tell his feelings to her. Finally, as both started to missing each other and what could they had together. (Video pitch is slightly altered)