The plays and songs were performed in the Irish language.

What could be more helpful toward that end than performing operas in the language of the audience?

Plays and operas were allowed to be performed in the Czech language.

The songs are typically performed in call and response form, in the native language.

The great majority of the bands perform in the Russian language.

Almost all works were performed in the Russian language.

In particular, a musical is almost always performed in the language of its audience.

Lyrics, according to them, are performed in the Enochian language.

The film was performed entirely in the constructed language Esperanto.

The band performs in the Frisian language and has become popular regionally.