The Happiest Holiday of All!

 is a song sung by Phineas, then eventually Phineas and Isabella.

Lyrics
Phineas: Of all of the holidays that come in a year

All of them filled with happiness and cheer

The one with the most I would have to say

Would have to be Valentine's Day

It's the Happiest Holiday, you see!

With romantic movies

And strawberry smoothies

To share before the day's complete

It's the Happiest Holiday, you see.

Roses are red, and violets are blue

Valentines Day is to share with you!

Every moment can be filled with joy

For every girl and boy

It's the Happiest Holiday of All!

All over town

Even with clowns

Valentine Cards in the Mall

It's the Happiest

Yes the Happiest

Holiday

Of All!

(Duet version)

Phineas: Of all of the holidays that come in a year

Isabella: All of them filled with happiness and cheer

Both: The one with the most I would have to say

Would have to be Valentines Day

Phineas: It's the Happiest

Isabella: Yes the Happiest

Both: Holiday

Of All!