An Opera For Man

In Poul Anderson's "How To Be Ethnic In One Easy Lesson," which opera is appropriate for the Festival of Man? The Opera Company board decrees that:

Carmen is too spatiotemporally parochial;
Alpha of the Centaur is about space travel whereas the Festival needs pre-space travel input;
La Traviata is too unvisual;
Gotterdamerung is mythically significant and visual but a modern audience would require realistic effects that would distract from the live performers.

However, Adzel resembles Fafner and sings well.

Solution: allow this alien visitor to express his appreciation of Terrestrial culture and thus to glorify humanity by getting Adzel to play Fafner! Unexpected yet appropriate.