It's not often you think you detect a future Brünnhilde in a soprano performing a great Verdi role, but that was the case when American Tamara Wilson made her UK debut last autumn as a stunning Leonora in the ENO production of Verdi's The Force of Destiny. So would she sing the Ring? Not for 10 years at least, she said. But then Mark Wigglesworth, a conductor she knew she could trust as partner, proposed the final scene of Die Walküre at the Proms, and the rest should go down in history.