In general, I’m no particular fan of composers talking in public about their own music. My family suggests that this is because I’m hoping to get the job of talking about it myself. But the real reason is that, on the whole, composers don’t tell the truth about their work – and indeed why should they? Creative work is a mysterious and impenetrable process, and it’s a very modern, right-to-know sort of assumption that those who do it should also be able to explain it. Probably nobody is. But people naturally suppose that when the horse opens its mouth, the oracle will speak.

Ian Bostridge is one of those artists – Andreas Scholl is another – whose technique is so suited to the recording studio, his recordings so ubiquitously loved and lived-with, that the opportunity to see him perform live has become one of conflict. Suffering from the same malaise as successful pop artists, concert performances inevitably become processed by over-exposed ears as acts of mimicry; studied verisimilitude to a recorded original jostles for validity alongside live creative re-imagining.

Rossini provided the lively curtain-raisers to both halves of this Chamber Orchestra of Europe concert, streamed live to Aberdeen where Shell, the sponsors, have something of a vested interest in keeping their employees entertained. The liquid gold on this occasion was of the legato variety and not one but two Fischers ensured that it flowed freely and purposefully. Ivan Fischer is quite simply one of the most perceptive and persuasive conductors on the planet; Julia Fischer (no relation) is the epitome of German cool and precision. She plays the violin rather well, too.

To launch a music festival with the Arditti Quartet, as Bath has just almost done (a pair of dance events preceded them), is a bold enough gesture, if no bolder than for the Arditti to open up their Assembly Rooms concert with Beethoven’s Grosse Fuge – a finisher if ever there was one. But for this particular group, late Beethoven might well seem like a kind of starting point. Beethoven was the first to write unplayable music for string quartet; and the Arditti have always specialised in the unplayable.

We might have expected that the rising young bel canto tenor Lawrence Brownlee would include “Ah! Mes amis… Pour mon âme” from Donizetti’s La fille du régiment (that’s the number with the nine top Cs) in his Rosenblatt recital at St John’s, Smith Square – but what we might not have anticipated, after so taxing a programme as this, was that he would sing it again. That’s 18 top Cs (and the rest), which isn’t just cheeky, it’s a message: start looking over your shoulder, Juan Diego Florez - Brownlee’s breathing down your neck.

One of the hottest tickets at this year's Brighton festival is Godfrey Reggio's 1983 film Koyaanisqatsi accompanied by live soundtrack performance from the Philip Glass Ensemble. Sold out for weeks beforehand, there are touts outside but most of the middle-aged Bohemian audience seem to have bought their tickets well in advance. The reason it's such a draw is that Koyaanisqatsi is a cult whose enthusiasts are multifarious.

"There is not one idea," wrote that intemperate critic Eduard Hanslick about Richard Strauss's Till Eulenspiegel, "that does not get its neck broken by the speed with which the next lands on its head." Rather a compliment, I've always thought, and certainly so as applied to James MacMillan's new Violin Concerto. As soloist Vadim Repin and conductor Valery Gergiev whirled us tumultuously through its hyperactive songs and dances, there was so much I wanted to savour, to hear again. That won't be a problem.