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Benvenuto Cellini was his failed opera. However, the overture to the opera is still performed. Le carnaval romain was written using music from Benvenuto Cellini.

These are getting easier...

The failed opera (at least in Paris)...Benvenuto Cellini

The overtures...Grande Ouverture de Benvenuto Cellini and Le Carnaval romain.

the elephant wrote:no valuable cash

So, can we receive unvaluable cash?