OK, I found it:

(The entire title seems to be "The Imaginary Opera - Opera like you've never seen!, or "L'opéra imaginaire -L'Opéra comme vous ne l'avez jamais vu !")

Seems directed by Gionne Leroy, and was made in 1995.

Here's a direct translation of the video details:


"Hello and Good evening,

Traviata - Bohemian Choruses

First of two extracts of "The Imaginary Opera"

Interpreted by Coro dell'Accademia di Santa Cecilia of Rome
Carried out by, for this extract, Gionne Leroy, director-animator, at Cambre.Bxl

Awesome, thanks! oh, and *requeue

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Discarding this video. It failed to receive enough votes to get sifted up to the front page within 4 days.