- Let it brain, let it brain, let it brain(uncredited)(based on "Let it snow, let it snow, let it snow")written by Jule Styne and Sammy CahnPerformed by Oliver Kalkofe and Peter Rütten
- We are family(uncredited)written by Nile Rodgers and Bernard Edwardsperformed by Sister Sledge(played as Rütten's ringtone)
- Stille Nacht(uncredited)written by Franz Xaver Gruber and Joseph Mohr(played in the background at the end of the first introduction)
- Es ist ein Hirn entsprungen(uncredited)(based on "Es ist ein Ros' entsprungen")German trad. christmas songPerformed by Oliver Kalkofe and Peter Rütten
- Last Christmas I gave you my brain(uncredited)(based on "Last Christmas")written by George MichaelPerformed by Oliver Kalkofe and Peter Rütten
- Oh Hypnobrain(uncredited)(based on "Oh Tannenbaum")German trad. christmas songPerformed by Oliver Kalkofe and Peter Rütten
- Das Hirn ist tot(uncredited)(based on "Der Hahn ist tot")German trad. songPerformed by Oliver Kalkofe and Peter Rütten
- Jingle bells(uncredited)written by James Pierpont(played instrumentally in the background during the farewell)
- Halluzinationen(uncredited)written and performed by Sophie Hunger(played during the credits)
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![Oliver Kalkofe and Peter Rütten in The Brain (2020)](https://m.media-amazon.com/images/M/MV5BOTRiZTJkMTItNzAxZi00MjdhLWI5MDItZjcyYmM3YzcwNzgwXkEyXkFqcGdeQXVyNDU2ODIxNjU@._V1_QL75_UY133_CR77,0,90,133_.jpg)