The Christmas Song

The Christmas Song (Chestnuts Roasting on an Open Fire) is a classic Christmas song originally performed by Nat "King" Cole in 1946. According to ASCAP, it is one of the most-performed copyrighted Christmas songs of all time. It is sung by Vanessa Doofenshmirtz in Phineas and Ferb Holiday Favorites.

Lyrics
Chestnuts roasting on an open fire Jack Frost nipping at your nose

Yuletide carols being sung by a choir

And folks dressed up like Eskimos

Everybody knows a turkey and some mistletoe

Helps to make the season bright, yeah

Tiny tots with their eyes all aglow

Will find it hard to sleep tonight

They know that Santa's on his way

And he's got lots of toys and goodies on his sleigh

And every mother's child is gonna spy

To see if reindeer really know how to fly

And so I'm offerin' this simple phrase

To kids from one to ninety-two

Although it's been said many times, many ways

Merry Christmas to you

They know that Santa's on his way

And he's got lots of toys and goodies on his sleigh

And every mother's child is gonna spy

To see if reindeer really know how to fly

And I'm offering this simple phrase

To kids from one to ninety-two

Although it's been said many times, many ways

Merry Christmas, Merry Christmas

Merry Christmas to you

You, oh

Note

 * This is the longest Phineas and Ferb song, and the only one over 4 minutes long. However, this may not count since it was not written for the series.