Over the past six weeks of the Proms the BBC’s hard-working Symphony Orchestra has performed everything from Britten to Brahms, Verdi to Volans. Their Mahler with Ed Gardner was an operatic epic, their programme of English music for Mark Wigglesworth glowed with wit. Yet hearing their ragged and unlovely account of Beethoven’s Ninth Symphony last night it was hard to remember their triumphs, hard even to remember the delicate account of Graham Fitkin’s new Cello Concerto that they delivered in the first half, so complete was their collapse.

A legendary septuagenarian wind player from Switzerland returns to the repertoire with which he made his name 50 years ago, and there's an exciting live reading of a gloomy fin-de-siècle symphony conducted by a contemporary French giant. The same conductor also treats us to a sparkling Stravinsky rarity, and a youthful duo lighten the mood with some Russian fireworks on Merseyside.

Never has a French invasion of these shores been quite so welcome. The two-day siege currently being staged in the Royal Albert Hall by Myung-Whun Chung and his Orchestra Philharmonique de Radio France opened last night with patriotic fervour in an all-French programme. Even Beethoven’s Triple Concerto began rolling its “R”s when cajoled into life by the dashing Capuçon brothers. While their strongly accented interpretation may not have been to everyone’s taste, as an exhalation after the meditative intensity of Messiaen and Dusapin it was perfectly judged.

Gleaming, shimmering, full of pizzazz, glitz and unashamed bling, although of the 18th-century sort, as befits its role as the most cheerfully mixed up and glittering show of baubles in Bath, the Holburne Museum reopened in May after three years' closure. At a cost of £11.2 million the museum has been expanded, rebuilt, refurbished and renovated. Much more of the collection, newly installed after extensive conservation, is also on view than hitherto. The whole works a treat. As many visitors have turned up in the first month as normally come in a year.

John Gay’s 1728 satirical drama was the first ballad opera. The vernacular work not only cocked a snook at the Italian operas that were so in vogue in 18th-century London, but it also lampooned Whig politician Sir Robert Walpole and the British love for scoundrels. It was an instant, huge hit; as a witticism of the time had it, The Beggar’s Opera made Rich gay, and Gay rich.

While we are far from lacking in top early music ensembles in the UK, there’s no denying that the French have a special affinity for this repertoire. While The Academy of Ancient Music and The Orchestra of the Age of Enlightenment are virtuosic champions of the genre, if we were all stuck in a sinking hot air balloon I’d lose both before sacrificing Les Musiciens du Louvre, Les Talens Lyriques, Le Concert d'Astrée or Les Arts Florissants. So it was with anticipation that I made my way to the Barbican last night to hear the UK debut of Le Cercle de l’Harmonie, the newest French orchestra on the block.

The extraordinary Longborough Opera Festival is with us again and for the next six weeks, in Martin and Lizzie Graham’s Palladian barn theatre near Stow-on-the-Wold. This year the world’s unlikeliest Ring cycle reaches Siegfried. But the improbability doesn’t end with Wagner; there is also Verdi (Falstaff) and Mozart – also, typically, a cyclic project, which has arrived at Così fan tutte. The whole set-up is so amazing that one longs to be enthusiastic about everything. But that can sometimes be difficult.

Time lurches when you see a historical play. But is it a case of autre temps, autres moeurs, or of plus ça change, plus c’est la même chose? Either way, the history needs to slap your face hard with recognition. Schiller’s Luise Miller is a 1784 play that clearly fires at its own vicious contemporary world, a catastrophically corrupt and unruly coalition of German states, and is its world just too far from our own to believe in the tragic young lovers at its core?

Mozart's Idomeneo is subjected to a famous bit of abuse in Milos Forman's Amadeus. "A most tiresome piece," a courtier critic sniffs. "Too much spice. Too many notes." As it happens, not a wholly inaccurate statement. The work is quite an exotic curry of an early Classical opera.

Georg Friedrich Händel of Halle probably never came here. Other great men certainly did: long after the official foundation of Göttingen's Georg August University in 1734 - the year in which the composer wrote a masterpiece, Ariodante, in another spa town, Tunbridge Wells - would-be or successful students included Goethe, Heine, the Brothers Grimm, Schopenhauer and Bismarck. It's hardly a Baroque town, either, though its beauties are manifold.