What is the perfect country house opera? A Midsummer Night’s Dream? L’elisir? Cenerentola? Figaro? All are strong contenders, but in the absence of anyone brave enough to stage Gerald Barry’s The Importance of Being Earnest the winner – surely – must be Falstaff.

Opera North created something approaching a new art form when they performed Wagner’s Ring in "concert stagings", putting their large orchestra in full view, with singers symbolically dressed and given limited front-of-stage space, and a continuous projected screen backdrop.

This will be the latest in Opera North’s acclaimed concert stagings of large-scale works, which have previously included Wagner’s Ring cycle, Puccini’s Turandot and Strauss’s Salome.

A crash, a scurry, a long, lilting serenade – the overture to Rossini’s Elizabeth I sounds oddly familiar. Not to worry. English Touring Opera has anticipated our confusion. “You may recognise this overture” flash the surtitles, to a ripple of laughter, before explaining that yes: this is essentially the same piece, originally composed in 1813 for Aureliano in Palmira that ended up attached to – of all things – The Barber of Seville.

When "Maestro" Riccardo Muti left the Royal Opera's previous production of Verdi's fate-laden epic, disgusted by minor changes to fit the scenery on the Covent Garden stage, no-one was sorry when Antonio Pappano, the true master of the house then only two years into his glorious reign, took over. He's now unsurpassable in the pace and colouring of the great Verdi and Puccini scores.

Would Verdi and Puccini have composed more non-operatic music, had they thrived in a musical culture different to Italy's? Hard to say. What we do know is that they both became absolute masters of orchestration – Puccini rather quicker than Verdi, living as he did in an entirely post-Wagnerian era.

Why is Un Ballo in maschera not as popular as the trio of Verdi masterpieces – Rigoletto, Traviata, Trovatore – that, with a couple of digressions, preceded it in the early 1850s? Its music is scarcely less brilliant than theirs, and if its plot is on a par of absurdity with Trovatore’s, it is at least, on the whole, more fun. One problem might be a certain thinness in the portraiture, as if Verdi was more interested in the incidents than in his characters.

Political machinations and backroom power-brokering, leadership battles and unscrupulous rivals – if ever there was an opera for this week it’s Simon Boccanegra. Premiered in 1857 but only coming into its own after substantial revisions in 1881, Verdi’s problem-child of a piece had its own struggle for survival and success, and the work’s rather lumpy dramatic architecture shows the scars of its various grafts and interventions.

Presenting the last Mozart symphonies as a three-act opera for orchestra, as Richard Tognetti and his febrile fellow Australians did on Monday, was always going to be a supreme challenge. It worked, as Boyd Tonkin reported here. Since then, the Barbican's grandiosely-named "International Associate Ensemble" has opened up the repertoire, synchronising with film (on Tuesday) and ending its mini-residency with the kind of vibrant rattlebag for which it's rightly celebrated.

Here it comes - get a grip. The tears have started flowing in the trio "Quid sum miser" and 12 minutes later, as the tenor embarks on his "Ingemisco" solo, you have to stop the shakes turning into noisy sobbing. The composer then lets you off the hook for a bit, but only transcendent beauty in singing and playing can achieve quite this effect in Verdi's Requiem.