‘Is there an end [to this opera] that is not trivial?’ asks the Countess in her final bars of Richard Strauss’s last opera Capriccio. Given the previous two and a half hours, the answer would seem to be a decided no. It is a frothy confection even by the standards of his later operas, the better parts reminiscent of the Prologue to Ariadne auf Naxos and some of Arabella.