Jingle Bells is a traditional Christmas song, however in the episode "Yes, Mikey, Santa Does Shave", Mikey sings a Recess-themed version of the song during the credits.
There are two versions of the song. One was played during the credits of "Yes, Mikey, Santa Does Shave", performed by Robert Goulet (Mikey Blumberg). Another version was used (with the lyrics unchanged) at the end of Recess Christmas: Miracle on Third Street, performed by Andrew Lawrence (T.J. Detweiler), Rickey D'Shon Collins (Vince LaSalle), Pamela Segall-Adlon (Ashley Spinelli), Ashley Johnson (Gretchen Grundler), Robert Goulet (Mikey Blumberg), and Courtland Mead (Gus Griswald).
The song was also partially based off the popular Jingle Bells spoof, "Jingle Bells, Batman Smells".
Oh! Jingle bells, Prickly smells, Menlo's such a drag.
Ashley girls flip their curls, and Finster is a hag.
Oh! Jingle bells, Randall tells, Kindergarteners scream
What's that noise, The Digger boys, For lunch they ate some beans
Oh! Jingle bells, Christmas spells, Two weeks off from school
No more books or lunch from cooks, The holidays are cool!