How can opera thrive in the modern era of instant and free entertainment? The solution, say two leading US artists, is to expose people when they least expect it.

"Yes, we are in a critical time for opera. But I think for about 400 years opera has been at a critical point," mezzo-soprano Joyce DiDonato says.

DiDonato, who's among the most prominent Americans in opera, has starred in productions around the world but has also sought out non-traditional venues.