Bryn Terfel : Becoming Boris Godunov

At London’s Royal Opera House, the Welsh bass-baritone Bryn Terfel has just completed the run of his debut role as the title character of ‘‘Boris Godunov,’’ the Russian composer Modest Mussorgsky’s only completed opera. ‘‘It’s one of the most iconic pieces written and has been described as a masterpiece,’’ says Terfel. The production, by the English director Richard Jones, is a new one, and the score...