Many matches are made in Fiddler on the Roof but the matchmaking prize goes to Grange Park Opera for getting Bryn Terfel to take on the role of Tevye. Having only recently played Sweeney Todd, and indeed throughout a varied career, Terfel has proved that he can treat lighter music with respect and sincerity, not to mention plenty of good humour.

Debussy completed only one opera (though he started plenty), but it’s the most perfect work imaginable, not only in sheer musical refinement and narrative precision, but in psychological penetration and above all in that exact grasp of the irrational nature of the medium that distinguishes the greatest operas from the merely effective.

After Calixto Bieito’s radical reimaging of Carmen, which opened at English National Opera this week, David McVicar’s version at Glyndebourne was bound to seem conservative. But it turned out to be a comparison of apples and Seville oranges: Bieito is certainly bolder, but McVicar is more sophisticated and digs deeper into the raw emotions of the work. It’s not a new production, but revival director Marie Lambert has kept it fresh, aided by a stunning cast and dynamic, energised conducting from Jakub Hrůša.

Fashion is a funny thing, in opera no less than the sartorial trappings that go with it (everything from tight, hipster trews to billowing ballgowns at last night's Glyndebourne season opening, in case you were wondering). Donizetti's classical tragedy Poliuto is historically a miss rather than a hit, never quite finding its footing in the repertoire, despite some early success.

Crotch-grabbing, suggestions of oral and anal sex, stylized punching and kicking and other casual violence offer diminishing returns in your standard Calixto Bieito production. Sometimes a scene or two flashes focused brilliance, which only makes you wonder why he doesn’t apply the same rigour throughout.

This was a very "concert" performance indeed. Across the stage music stands stood like sentinels lest any rash singer attempted to stand out and – surely not – act. Such fears were misplaced (or the stands did their job) in the end, as the music was what mattered and everyone stood and sang, with one outstanding exception, the Kundry of Mihoko Fujimura.

"The darkness deceived me," sings Leonora in Act I as she mistakenly rushes into the arms of the Count di Luna, rather than those of her beloved, the mysterious troubador Manrico who’s been serenading her for nights on end. Seeing Robert B Dickson’s sepulchral lighting in Scottish Opera’s semi-new production of Verdi’s melodramatic shocker Il trovatore – an updated version of the company’s 1992 staging – you can understand why.

I must have been one of the few in Saturday’s audience for Richard Ayres’s new opera who had never seen Barrie’s play or read the book, so I’m unable to judge how faithfully it renders the original – in case that matters. Somehow one knows the dramatis personae: Peter Pan himself, the Darling family, Nana the dog-nurse, Captain Hook, Tinkerbell, Tiger Lily and of course the ticking crocodile, who swallowed Hook’s watch along with his arm. They are all here, wittily, sometimes brilliantly, reimagined in Keith Warner’s panto-like staging.

Over the past decade Alice Coote has emerged as a singer of rare and exquisite vocal quality. Even when the direction of a project is questioned, there has generally been consensus that she generally sounds gorgeous. The concept of Being Both, a juxtaposition of Handel mezzo arias for both male and female characters, is brilliant both musically and commercially. It allows a fascinating exploration of identity and sexuality in a period when both, in opera, were pretty fluid; and it makes, conveniently, for a programme of Handel’s greatest hits.

When ENO announced its return to Gilbert and Sullivan, rapture at the news that Mike Leigh, genius Topsy-Turvy director, would be the master of wonderland ceremonies was modified by its choice, The Pirates of Penzance. Last staged at the Coliseum – and unmemorably – as recently as 2004, the fifth Savoy opera seemed less in need of revisiting than several larger-scale successors.