Five minutes into this concert, at that stage a polite cello and piano duo, there was a raucous bellowing from the rear, so loud that the front stalls leapt. The delicate cello spiccato continued, despite the persistent bellowing. Gradually, the musicians adapted to the new sound, and to widespread astonishment, Senegalese singer Mola Sylla, chanting in Wolof, descended through the stalls onto the stage.  

Among the diaspora of younger-generation Russian or Russian-trained pianists, there are at least four whose intellect and poetry match their technique. Three whose craft was honed at the Moscow or St Petersburg Conservatories – Yevgeny Sudbin, Alexander Melnikov and the inexplicably less well-feted Rustem Hayroudinoff – have made England their home. Boris Giltburg - the youngest of the group with a fifth, Denis Kozhukhin, close on his heels - left Moscow for Tel Aviv when he was a child and has had a different training.

The Southbank’s artistic director Jude Kelly was out in force at this penultimate weekend of The Rest is Noise festival, delivering little triumphalist, Ryan Air-like fanfares, reminding us how pioneering they had been to programme composers such as Igor Stravinsky, Richard Strauss, Benjamin Britten and Philip Glass - composers who no one had ever heard of before they'd bravely decided to put them on.

Imagine how discombobulated the audience must have felt at the 1962 premiere of Shostakovich’s most outlandish monster symphony, the Fourth, 26 years after its withdrawal at the rehearsal stage. Those of us hearing its natural successor, Schnittke’s First Symphony, for the first time live last night didn’t have to (imagine, that is).

One of the joys of the Southbank Centre’s year-long The Rest Is Noise series has been the opportunity to hear some unusual period pieces among the more standard repertoire. In the case of 200 Motels it is a concert premiere for a genre-bending work which was pulled from its 1971 Albert Hall slot due to complaints about its obscene content.

Anyone who saw or attended this year’s Last Night of the Proms will know that Marin Alsop is a born communicator with a wry sense of humour. Another of those youthful crowds The Rest is Noise festival keeps attracting gave her a hero’s welcome last night, and she responded with easy compering.

If ever there were a week for London to celebrate Poulenc in the lamentably under-commemorated 50^th anniversary year of his death, this is it. Two major choral works and two fun concertos at last join the party. But if Figure Humaine and the Concerto for Two Pianos look like being well positioned in the BBC Symphony Orchestra’s Barbican programme on Saturday, Yannick Nézet-Séguin’s chosen two were the victims of his own success in Prokofiev interpretation.

It had to finish with “When an Old Cricketer Leaves the Crease”, the commentary on a building block of British life which marks the passing of time more acutely than anything explicitly counting the minutes which precede leaving the field, whether in sport or life. Roy Harper originally released this elegy in 1975, when he was in his 30s. As last night’s encore, it was even more poignant. Harper is now 72. There were moments when he explicitly said he might not see an audience again. He was in fine form: alive, joking, scatty and, at times, on fire.

You couldn’t help marvelling at how good Alison Moyet looked. It wasn’t just her dramatically slimmed-down physique, but also the sense of her being truly comfortable in her own skin. Partly, that may have just been a result of an increasingly optimistic outlook. But also it seemed to emanate from Moyet's confidence in her new material. Since its release in May, her new album, The Minutes, has been well received. Could the songbird from Billericay also work that synth-heavy magic, live?

There’s been a lot of backslapping over the success (so far) of The Rest is Noise festival, the Southbank’s year-long trawl through the music of the 20^th century. They’re particularly pleased about the numbers of ignorant musical souls they’ve managed to convert over the past half a year. I hate to break it to them but getting a return on the music of the first half of the 20^th century (which has included a surprising amount of barely 20th-century Elgar, Vaughan Williams, Strauss and Sibelius) is the easy bit. Last night we reached the 1940s and 1950s.