The two-course evening out is made possible by the Wigmore Hall’s late Friday-night concerts, so if you get out of a central-London show - or dinner - by, say, 9.30, you can add a second layer of entertainment at 10. In my case, a ferociously poor hour spent at contemporary dance in Sadler’s Wells was offset by an hour with Joanna MacGregor in a stimulating splicing of Bach and Shostakovich piano music that at least offered something to think about, if not ultimate satisfaction. Evening not entirely wasted, then.

It was Groundhog Day. Murray Perahia, due to play the Schumann Piano Concerto last night under Bernard Haitink, was indisposed and at the last minute Maria João Pires rushed in with Mozart 27. Just the same happened in 2006, strangely enough, with exactly the same three artists and orchestra. As you ponder that for a coincidence, what this shows is the powerful bonds that exist between musicians, between Haitink and these two pianists, whose virtues have much in common: impeccable lucidity and light-filled emotion.

What next - Boulez and Daniel Barenboim in Tchaikovsky and Rachmaninov? The two numbered Liszt concertos are probably as far as they're going to go in lacier romantic repertoire, and last night it didn't feel far enough to justify the predictable standing ovation.

It may have taken just three days to record, but this new duo recording from sax player Branford Marsalis and pianist Joey Calderazzo has 13 years of music-making behind it, dating back to when Calderazzo replaced the late, great Kenny Kirkland in the Branford Marsalis Quartet in 1998.

When Alfred Brendel first mentioned Kit Armstrong to me, in early 2008, I knew there was a film there. He was brimming with excitement: Kit had come to him with an interpretation of a Chopin Nocturne that displayed a command and maturity that was baffling considering Kit was 13 at the time of the recording. Alfred led me into his inner sanctum, a practice room filled to bursting with two Steinways, a large carved idol from New Guinea, Liszt’s death mask and a rich and varied collection of paintings and images, some of them revealing the pianist’s wicked Dadaist sense of humour.

This week we’ve some neglected British orchestral music played by the UK’s oldest professional orchestra, including a spectacular work later championed by Britten. An offbeat disc of concertos for two pianos provides scintillating entertainment. And there’s a contemporary opera by a composer best known for his film soundtracks.

There must be at least 100 more interesting pianists in the concert world than Lang Lang, but perhaps he is just the best publicist around, because nothing else can explain why such a vacuous display as he gave last night at the Royal Festival Hall could bring a standing ovation. Most of the evening felt like being on a plushly cushioned chintz sofa with Tinkerbell, listening to Bach, Schubert and Chopin being served as a cream tea. Lang Lang Inspires is the slogan at the Southbank Centre all this week, but what is inspiring? His art - or just his vast skills as a public communicator, with 40 million Chinese piano students now credited to the Lang Lang effect?

This week we’ve offbeat violin and viola duets played by a renowned husband-and-wife duo, Scarlatti keyboard sonatas played on piano, and a very Italian take on Shakespeare from one of the 20th century’s fieriest conductors.

How important is it to hear “the composer’s intentions” at a concert? Maybe only the interpreter’s intentions are possible. The young Russian pianist Alexander Melnikov challenges the golden rule of faithfulness to source with the resources of today’s piano - not the ropey old Soviet thing Shostakovich would have had, or the limited piano Schubert would have known, and last night at the Wigmore Hall delivered an ear-opener of a recital all about modern pianism at its most fascinating and provocative.