A 70-minute piano concerto unsparing in its technical demands on the soloist yet by no means splashy in the Lisztian sense, concluding with a chorale in praise of Allah to be intoned (per the composer’s wishes) by an invisible all-male ensemble singing in the nude (I know)—this is the Everest the formidable keyboard virtuoso Igor Levit has set out to climb, in the company of maestro Antonio Pappano and the London Philharmonic, his trusty Sherpas. —M.G.