Music at the party: a Perez Prado rip-off
Nino Rota cleverly worked over a tune Perez Prado wrote in 1958, holding down the happiness this tune evokes.
The italien director Nanni Moretti also used this tune for the final squence of the movie "Aprile". I think as a reverence to Fellini - the camera catches the whole film-team at the set moving to the tune ...
compare:
Here is the music as played at the party scene (the party scene at the end of the movie) "La Dolce Vita":
https://www.youtube.com/watch?v=ukefSDLTJ8E
Here first a scene of the movie "Leave, you thieves!" (1961) with Perez Prados' original tune "Why wait mambo", followed by Nanni Moretti's "Aprile" (1998):
https://www.youtube.com/watch?v=wKrU38sOpuo
Life is sweet!