Prospects hadn't seemed that great for this new Covent Garden Così. Could Semyon Bychkov, powerful earth-and-fire conductor of Richard Strauss's darker operas, possibly find the right proportions of air and water in Mozart? Would German director Jan Philipp Gloger prove better than his Bayreuth reputation? As it happened, the sextet of half-unknown principals never sang less than respectably, and the production had some good ideas, though mostly linked to the look of expensive sets rather than to focused work on the psychology of confused lovers.

Medieval to Modern – Jeremy Denk’s Wigmore Hall recital took us on a whistle-stop tour of Western music, beginning with Machaut in the mid-14th century and ending with Ligeti at the end of the 20th. The programme was made up of 25 short works, each by a different composer and arranged in broadly chronological order, resulting in a series of startling contrasts, but punctuated with equally surprising, and often very revealing, continuities.

Soft power in the shape of cultural ambassadors can go a long way. With a little help from its big guns in banking and industry, Germany has given this year's Proms no less than four of its major orchestras – from Leipzig, two from Berlin, and now from Dresden: all the more reason to wave those EU flags on a typically international Last Night in three days' time.

Daniel Barenboim is as distinctive as he is unpredictable. His considerable strengths – dynamism, passion, keen intellectual engagement – are balanced by some notable weaknesses – clunky tempo changes, lack of detail – but all configure differently in each performance. This Prom was a success largely for the fresh perspectives he brought to Mozart and Bruckner, both composers prone to stiffness and formality from less adventurous performers.

Branding, as any marketing manager will tell you, is everything when it comes to selling, and when it comes to selling, classical music is no different from cars, cornflakes or shampoo. It explains why a Mahler orchestral song-cycle would fill the Royal Albert Hall while a similar work by his love-rival and near-contemporary Alexander von Zemlinsky last night left it half empty.

The Aurora Orchestra’s gimmick at Prom 21 was the same as in the last two seasons: playing a major classical symphony from memory. This was touted as an “astonishing feat” by the concert’s on-stage presenter Tom Service but, although unusual, is it really that extraordinary? When I go to the opera I am not moved to congratulate the singers on performing without music. In fact, the lingering on what should be an incidental feature was in danger of obscuring a more interesting point: the excellence of the orchestra’s actual playing.

It's never easy readjusting to the weird and sometimes wonderful acoustics of Albert's colosseum at Proms time, least of all when the first thing you hear there comes from a period-instrument band. Tuning in to Jérémie Rhorer's Le Cercle de l'Harmonie didn't take too long, however, while the urgent projection and diction of a splendid new Italian soprano on the block, Rosa Feola, did the hall proud. And all this to a packed house of 5,000 or so – not bad for relatively unknown performers, though the neat Mozart-Mendelssohn programme must have helped to sell all the seats.

You know, of course, why you should always choose the left leg of a roast partridge? Because that’s the leg the bird stands on when resting: it’s plumper, tastier and altogether more succulent. These things matter, and in Jean Francaix’s extraordinary 20-minute a capella showpiece Ode à la gastronomie they’re elevated to the level of a religion. “It’s very French”, Robert Hollingworth warned us before this performance by I Fagiolini at the 2016 Lichfield Festival – and he wasn’t joking.

To reach Sarastro's temple of wisdom, you have to climb a series of exquisitely manicured terraces to a tiny cloister in one of the world's great gardens. Iford Arts have been inviting high-quality small opera companies to perform and produce their own operas since 2005. Charles Court Opera, paragon of G&S and boutique panto, was the right team to ask to provide a Magic Flute tailored for a cast of nine and an audience of 80.

“It doesn’t need me,” Sebastian Thomas writes in this season’s Longborough programme, “to labour the idea that the content of a theatrical or musical piece should find some relevance to our own lives.” No, indeed. Practically every director one could name labours it already, sometimes with very odd results.