Stravinsky and Bartók both escaped Europe at the start of the second world war to live in the USA. For Stravinsky it was the start of 30 years of mostly happy exile, while Bartók was to survive for only five years. Works from their time in America featured in Valery Gergiev’s penultimate concert as principal conductor of the LSO last night.

This Barbican concert began with a Mendelssohn overture and ended with a Haydn symphony. But on stage were the BBC Symphony Orchestra and Ilan Volkov. What did you expect in between, a Mozart piano concerto? Not likely. Instead they gave the first performance of No.48 (night studio) by Richard Ayres. English-born but resident in the Netherlands and working mostly on the Continent, Ayres has impeccable post-Minimalist credentials (studies with Louis Andriessen and Morton Feldman) which do no more than hint at how his music behaves – like a kid in a well-stocked acoustic sweet-shop.

This was Henryk Górecki beyond the Third Symphony. His otherwise ubiquitous masterpiece was notable by its absence from yesterday's programme. That was surely a conscious decision, and a wise one, allowing his many other important works to come out from its shadow. Górecki turned out to be an ideal subject for the BBC Symphony Orchestra’s “Total Immersion” treatment. His music gradually evolved throughout his career, from acerbic neoclassicism, to esoteric serialism, and then to austere minimalism.

And so the Academy of Ancient Music’s triptych of Monteverdi operas at the Barbican comes to an end, three years after it began with Orfeo. If 2014’s Poppea was the cycle’s sexually-charged climax, then this Ulisse is the dark, contemplative coda – a sobering moment of morality after the victorious excesses of opera’s most venal couple.

With eyes trained on sporty Rio de Janeiro once more for next year’s Olympic Games, cultural portals on to the city are bound to be offered in all sorts of places around the world. One such is Rio+Film, a new film festival at the Barbican Centre focusing exclusively on the great Brazilian city by the sea. Rio+Film is likely to have further editions elsewhere.

Was it when we all obediently received, then held, contemplated, then savoured, then (and only then) swallowed a single grape? Or was it as we paced solemnly round the room for the sixth time, whirling brightly coloured plastic tubing above our heads to make a whirring sound, that the penny dropped? Actually I’m fairly certain it was being exhorted, for the nth time, to “embody alertness”, to feel my “super-alert hands” that did it for me. Don’t be fooled by the marketing: Rolf Hind’s Lost in Thought is no more an opera than I am a yogi.

In 2007, Jiří Bělohlávek set the distinctive seal on his leadership of the BBC Symphony Orchestra and their ongoing Mahler cycle with a riveting performance of the Third Symphony. The legacy he established of a deep, well-moulded string sound which the orchestra didn’t really have before has left its mark on his successor Sakari Oramo’s even more impassioned attempt at the most epic of all Mahler’s symphonies.

The frail bridge between Baroque and Classical aesthetics was the theme for this debut UK appearance by Insula, the period-orchestra extension to Laurence Equilbey’s superb vocal ensemble accentus.

Last night's perfectly-judged, superbly communicated performance of Mahler's Fourth Symphony served as a reminder that the passion, experience and astonishing musicality of 86-year-old conductor Bernard Haitink are things to be cherished and never taken for granted. The symphony, first performed in 1901, was the main work in this second of Haitink's three concerts with the LSO before they leave together for Japan.

The set turns out to be the thing now that Benedict Cumberbatch's star turn in Hamlet has finally arrived, trailing in its wake a level of expectation, hysteria and scrutiny that might well have made many a lesser actor head for the hills.