Hair-raising guaranteed or your money back: that might have been a publicity gambit, had there been one, for Sakari Oramo’s latest journey with the BBC Symphony Orchestra around a Nielsen symphony. That he knows the ropes to scale the granite cliff face of the Danish composer’s Fourth, “Inextinguishable”, Symphony was not in doubt (he gave a shattering performance with his own City of Birmingham Symphony Orchestra at the 1999 Proms).

The title has it about right: no matter what it is they are busily acquiring, collectors seem to be an obsessive bunch, and their obsessions can achieve quite magnificent proportions. The stereotyped image of the collector as a socially challenged monomaniac doesn’t really fit with the popular understanding of the artistic temperament, though.

Ernst Krenek is probably best remembered nowadays as the composer of Jonny Spielt Auf – the quintessential Zeitoper of Weimar Germany and later the archetype of all that was designated “degenerate” in art by the Nazi regime. And perhaps also as – briefly – the husband of Anna Mahler, daughter of Gustav. But Krenek was far more than that. He was a magpie collector of styles and influences whose large corpus of work reflects almost every major 20^th-century trend.

Mercifully not preceded by a Broadchurch-style hype-tsunami, the new series of Mr Selfridge has slipped neatly back into the Sunday 9pm slot as if it's the rightful owner just back from a year of travelling round the world. It's not revolutionary, ground-breaking or "subversive", but equipped with some new characters and promising plotlines, this opening episode ushered us into the post-World War One era with a spring in its step and the wind in its hair.

For his second programme this week with the London Symphony Orchestra, Sir Simon Rattle conducted variations on a programme he’s been doing for years. So what’s the theme? Invention and hysteria, you might say. Berg’s Marie in Wozzeck and Stravinsky’s virgin in The Rite of Spring both meet gory if wordless ends. Ligeti’s Chief of Police in Le grand macabre reverses roles and deals death to anyone in her path. Or at least threatens it.

The Simón Bolívar orchestra is the musical answer to the question “Would you like to supersize that?” A youth orchestra in bulk, if no longer in name, the ensemble has made a signature of its heft, making repertoire work on its own terms rather than adjusting itself to fit. On Thursday night, full-fat Beethoven and Wagner that threatened to overspill in the generosity of their gestures, so how would the orchestra fare with Mahler’s mighty Fifth Symphony?

There are moments in this collaboration between performer and theatre impresario Christopher Green and best-selling novelist Sarah Waters, where, rather like with a Stewart Lee stand-up routine, the audience has to make a conscious decision whether they are going to go all the way not so much with the idea presented, but with the mode of presentation. There are times in The Frozen Scream when it feels like the punchline is getting further away rather than closer.

How disorienting it is to find century-old works in the concert repertoire of which you can still say “I’ve never heard anything like it”. That must have been the reaction of most audience members last night to Tuscan-German composer Ferruccio Busoni’s 85-minute symphony-concerto for piano, orchestra and male voice choir, since only a few will have caught what classical anoraks tell me was its only other London performance in recent years, at the 1988 Proms.

Tamara Stefanovich and Colin Currie – a dream team for Birtwistle’s The Axe Manual. Both are new music specialists with a gift for grace and dexterity, even in the most complex works. The score sets up a range of sophisticated relationships between piano and percussion, from sympathetic resonances to complex interplays of stretto and hocket. Yet none of this fazes the two players, nor ever challenges their close ensemble, seemingly telepathic in its precision.

I must admit to feeling, briefly, just a little disappointed on first sight of Maggi Hambling’s Walls of Water, nine new paintings on show at the National Gallery. Perhaps it was the evocative title, which promises high drama and instant gratification, something obviously and extravagantly impressive. In short, I was expecting something bigger, an absurd statement because eight out of the nine canvases measure more than six by seven feet. And yet, they are small.