Covent Garden’s masked balls circling around the New Year feature not the seasonal bourgeois Viennese couple and a bat-winged conspirator but a king, his best friend’s wife and – excessively so in this production – the grim reaper. Big voices are what’s needed if it’s Verdi rather than Johann Strauss II, and if we can’t have Jonas Kaufmann, who’s committed his energies to a lesser protagonist, Giordano’s Andrea Chénier, this coming January, then much-trumpeted Maltese tenor Joseph Calleja will have to do.

A Martian, a Spitfire and a flatulent penguin are the unlikely ingredients for The Way Back Home, English National Opera’s first foray into the colourful world of children’s opera. And if those don’t sound like enticement enough, be reassured, at only 45 minutes long this really is a child-friendly taster of a genre that doesn’t always get the best press when it comes to accessibility.

There have been legendary conductors, and then there was Herbert von Karajan. He was a colossus of post-World War Two classical music, equipped with fearsome technical mastery allied to a vaguely supernatural gift for extracting exquisite sounds from orchestras. But that wasn't all. An expert skier with a passion for high-performance cars and flying his own jet, he was as charismatic as a movie star or sporting idol.

In an operatic world in which the director is an increasingly despotic king, it’s good to be reminded that, sometimes, not staging an opera is the most radical reading of all. No elaborate set or concept dominated David Edwards’s one-off Pelléas et Mélisande at the Royal Festival Hall last night. There were just suggestions, allusions, echoes. And a cast – what a cast – that came close to perfection.

A great creative partnership like the one between composer John Adams and director Peter Sellars can endure the occasional wobble. In his peerless autobiography Hallelujah Junction Adams is frank about the information overload in Sellars’ premiere production of the millennial opera-oratorio woven around the birth of Christ, El Niño.

“Watch out for the dog!” instructs Covent Garden’s programme for its latest revival of L’elisir d’amore. These creatures do have a way of stealing shows, but the canine who dashed across the flat Italian cornfield after Dr Dulcamara’s decrepit lorry had some impressive competition – from Vittorio Grigolo’s behind.

Were it not for William Christie and Les Arts Florissants, the vocal and instrumental ensemble he started in Paris in the 1970s, the beauties of the musical French Baroque might have remained a dusty fact of pre-Revolutionary history. As it is, there is barely a singer, player or conductor now performing Lully, Couperin, Rameau, Charpentier et al who has not benefited from the life’s work of this diligent conductor-musicologist. Through him, their arts are indeed flourishing.

Søren Nils Eichberg’s new opera Glare is advertised as a “taut” thriller. It’s actually a short thriller. Big difference.

The question of whether or not opera – a medium that wouldn’t win any prizes for sprinting –  can successfully pull off a thriller – a genre that lives and, more often, dies in its dramatic agility and lightness of foot – is a very real one. I’ve never seen it succeed yet, but would be delighted to be proved wrong. Glare, unfortunately, is not that proof.

One queen is much like another in so-called “historical” Italian early to mid 19th-century opera. Elizabeth of England, Christina of Sweden, take your pick, they all fall for a tenor courtier who loves Another (the seconda donna, soprano or mezzo). With Donizetti, the musical drama is almost as disposable as the plot until a stonking number or two rolls up. Jacopo Foroni, more or less unknown until Wexford resurrected him a year ago, has a few more felicitous orchestral touches but nothing as memorable as Donizetti's best.

Dvořák’s rustic operetta sits, swinging its legs rather diffidently, historically somewhere between the neverland Bohemia of Smetana’s The Bartered Bride and the lacerating reality of village life in Janáček'’s Jenůfa. The Cunning Peasant’s charms lie in its string of sophisticated songs and dances, more through-composed than Smetana’s, and in the abundance of not over-taxing roles, as well as chorus numbers, it offers to students.