South Park - Season 7, Episode 11: Soundtracks

Cartman runs though Casa Bonita and experiences all what it has to offer in less than a minute without trying to get caught by his friends and the police.

[Cast performance] Butters sing in the bomb shelter.

The music is heard every time Cartman imagines or dreams of Casa Bonita.

Butters Stotch sings this song while in the bomb shelter Eric Cartman tricked him into staying in it.