Before we hear a note, extras dressed as maintenance staff potter about the stage. They try to erase a scrawled slogan on a wall that reads “Hur allt började”: how it all began. “It” is the story of Wagner’s Ring cycle as presaged in the introductory drama of Das Rheingold, which kicks off the tetralogy. Prior, though, to the ominous, mesmeric swell of the E flat chord that anchors the Rheingold prelude, Stephen Langridge’s production for Gothenburg Opera shows us a busy, dogged human world of toil.

We’re not good at lack these days. Just look at the concert hall, where increasingly you turn up to find not just an orchestra and soloists but a giant screen. Videos, projections, live speakers, "virtual choirs"; if there’s so much as a chink of an opening in the music, you can bet that someone will try and fill it. It seems to come from a place of generosity, a desire to reach out, to supplement, to amplify, to explain, just in case we didn’t feel or see or understand before. But it’s also a gesture that takes away our agency as an audience, turns us spongy, limp as listeners.

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.

In a week of flickering memorial candles and cascading poppies we’ve all been asked to contemplate the pity of war – to remember and to seek consolation in beauty and silence. But before we can earn that consolation and mourn in that silence there must surely be rage and noise, bloody specificity before aesthetic abstraction.

Lightness and gravity in perfect equilibrium have always graced Vladimir Jurowski's Stravinsky.

What a scrumptious spread of musical virtuosity the Barbican has laid on with the aid of its international guests this week.

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.

Joseph Phibbs is not the first composer to make an opera out of Strindberg’s Miss Julie, and it is not difficult to see the operatic appeal of this taut, passionate three-handed drama.

Supernatural wonders, consciously avoided in Rossini's enlightened tale of goodness rewarded La Cenerentola and unrealised by second-rank composer Isouard in his 1810 Cendrillon, recently uneathed by Bampton Classical Opera, flood Massenet's gem-studded version of the Cinderella story. For a contemporary production to avoid visual representation to match would be foolhardly; but to yoke magic to an alternative narrative can also be confusing.