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.

Gone, it seems, is the era of epic three-part Proms. Sunday afternoon's programme, partly billed as a children's hour, might have pleased pianist and pundit Stephen Hough, whose recent broadsheet plea for shorter concerts somewhat overdid the need (lunchtime events already cater to concertgoers in a hurry very well, and the Proms has its late-nighters too). But it left many of us wanting more, not just of Ravel in the second half but also of the distinctive Simón Bolívar earthiness, which was given free rein only in one spirited encore.

The BBC Proms is perhaps the only music festival in the world that would (or could) have programmed performances of Steve Reich in a Peckham car-park and Brahms by the Berlin Philharmonic within a few hours of each other. The audacity of it is glorious, the breadth exhilarating, and the fact that both sold out intensely heartening.

What do Boulez's Éclat, for 15 instruments, and Mahler's Seventh Symphony, for over 100, have in common? Most obviously, guitar and mandolin, symbols of a wider interest in unusual sonorities. But while Boulez aims, as often, for needle point precision, Mahler uses selective groups, at least up to his finale when he exuberantly exchanges night for day, to create peculiar and unsettling grades of chiaroscuro.

Erkki Melartin: Traumgesicht, Marjatta, The Blue Pearl Finnish Radio Symphony Orchestra/Hannu Lintu, with Soile Isokoski (soprano) (Ondine)

The BBC Proms is the largest classical music festival in the world – an event whose ambition, accessibility and breadth wouldn’t be possible without the Royal Albert Hall and its capacity of well over 5,000 people. But the building that makes this festival possible, that provides the space for the hundreds of Prommers who fill the arena each evening, is also its biggest curse. Its unwieldy, awkward acoustic is a problem that must be faced and resolved every night, and when it comes to Early Music, it’s a resolution that’s partial at best.

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.

There is no reason why young musicians shouldn't make something special out of mature thoughts on mortality. Nor is the Albert Hall problematic when it comes to haloing intimate Bach as finely as it does massive Bruckner. The Gustav Mahler Youth Orchestra glowed in both the large scale and the small last night. Any shortcomings were in senior hands and hearts - possibly those of a usually great conductor, Philippe Jordan, more likely the infirm purpose of his composer, Bruckner. The most surprising disappointment of all came from that most prized of baritones, Christian Gerhaher.

The ingredients should be familiar by now. A plucky range of contestants drawn from across the geographic and social spectrum. A selection of interesting back stories. Demanding judges, their prickly edges softened by a fluffier presenter.

It began with opera – Cecilia Bartoli’s pretty much universally adored Norma from Salzburg. And the Edinburgh International Festival ended with opera, too – Mozart’s Così fan tutte, in a co-production with the Aix-en-Provence Festival. Like Norma, it was an updating to more modern times – but one that in this case prompted the International Festival to send out a letter warning of the production’s explicit adult content.