Before curtain-up on the opening night of this revival of Penny Woolcock’s production of The Pearl Fishers, ENO's head of casting arrived on stage with a microphone. No doubt delightful company in person, he was an unwelcome sight here. Sophie Bevan had a stomach bug, he explained – the disappointment was palpable. But she'd be bravely singing anyway – grateful applause broke out. In the end, our goodwill was not called upon in the least, since Bevan's voice in her debut as Leïla was as strong and agile as ever.

What a red letter day it is when a work you’ve always thought of as problematic seems at last, if only temporarily, to have no kind of fault or flaw. That was the case for me on Sunday afternoon with Britten’s penultimate opera, Owen Wingrave, launching this year’s Aldeburgh Festival with an ideal cast fused as one with the young Britten-Pears Orchestra thanks to the self-evidently intensive collaboration of director Neil Bartlett and conductor Mark Wigglesworth.

The practical considerations and limitations of choosing a work for a student showcase can lead to some wonderfully original programming. It doesn’t get much more original than a pairing of Thomas Arne’s ballad opera The Cooper with Stradella’s oratorio San Giovanni Battista, currently being staged by the Guildhall School of Music and Drama.

How delicious that Garsington Opera has turned to Offenbach. The main impetus for this cheering development, taken up by Artistic Director Douglas Boyd, is conductor David Parry, who both translates (extremely well) and wields the baton.

Sex farce, class comedy, crime thriller, existential tragedy, supernatural shocker - Don Giovanni is, as Jonathan Kent notes about his production in the Glyndebourne programme, a cabinet of curiosities. Mozart's music hurdles to and fro across two centuries, the baroque 18th century and the disorientating romantic depths of the 19th; the characters are either stock (Leporello the comic sidekick, Anna the wronged virgin) or so subtle that they need redefining for every staging and every time (Elvira, and the lothario Don Giovanni himself).

Tumblers, confetti, stiltwalkers, flags, crowds, a giant skull, and that’s just the overture. If anyone thought that Terry Gilliam might struggle to match the scope, scale or impact of 2011’s Damnation of Faust with his follow-up then they’re probably feeling rather foolish right about now.

It takes a brave opera company indeed to stage Peter Grimes this summer. Benjamin Britten’s 2013 centenary celebrations took us to “peak Britten”, with performances of all his major works as well as the unprecedented, outstanding Grimes on the Beach. Then, this January, David Alden’s production of the opera returned to the Coliseum: direct, theatrical and if anything more potent than five years before. How then, could Grange Park – a David to the Goliaths of the Aldeburgh Festival and ENO – possibly compete?

Poulenc’s Dialogues des Carmélites is a special and very particular opera. There is nothing else quite like it. Just as the drama - set to the composer’s own libretto - teeters between fear and faith, so too does Poulenc’s score, an extraordinary apposition of austerity and lushness where belief is harmonically consonant, festooned in seraphic harp glissandi and warmly homogeneous middle-voices. But fear is omnipresent in the shadows punctuating the score with a succession of precipitous dissonances and the alien sonorities of instruments like the piano.

A trio of Rosenkavaliers: what more could one want as we near Richard Strauss’s 150^th birthday? Well, more of the less often performed operas, for a start. But as this is the Straussian cornucopia, it’s not going to tire those of us who love it beyond reason, and Andris Nelsons’ concert performance with his devoted City of Birmingham Symphony Orchestra eventually delivered as much in its rather peculiar way as the Barbican excerpts earlier this month and Richard Jones’ gobsmackingly original, disciplined take at Glyndebourne.

Schoenberg’s last, unfinished, opera, seldom staged, might almost have been written for the Welsh. At its heart is some of the most refined and intricate choral writing since Bach, but linked to stage directions so complicated that one wonders whether the composer had any idea of the technical difficulties he was putting in the way of a fully realized production. The fact that this new WNO production funks most of the stage business is not the fault of the company’s truly marvellous chorus, whose musical performance alone would be worth twice the ticket price.