Nobody can remember seeing a film about a piano tuner before. Happily, Pianomania isn’t merely unique; it’s a riveting documentary into the bargain. It takes as its subject the micro-detailed and nit-pickingly demanding routine of Stefan Knüpfer, Master Tuner for that Rolls-Royce of the piano industry, Steinway & Sons. Among Knüpfer’s celebrated clients are such titans of the keyboard as Lang Lang, Alfred Brendel, Till Fellner and Julius Drake, all of whom appear in the film’s 93-minute span. The main driver of the narrative is the ongoing account of how Knüpfer helps Pierre-Laurent Aimard to record Bach’s Art of Fugue.

It's still not clear whether his clever, brilliantly orchestrated compositions are here to stay (though they're certainly having a good run at the moment). As a conductor, he's not yet nimble on his feet. Yet after yesterday evening's colossal recital, I doubt if anyone would deny that Thomas Adès is a pianist of the first order, a dramatic master of keyboard colour who pulls you into his edgy but often very beautiful sound world and sometimes casts you adrift from your critical moorings.

Last night was Sun night at the Royal Opera House, when the opening night of the ballet season was supposedly entirely attended by winners of The Sun’s ballet-ballot.