Any performer of Mozart's piano concertos must have wondered how those sparsely notated sections would have been realized at the time. No one is better placed to provide an answer than the composer's own pupil Johann Nepomuk Hummel. Here now, for the first time in modern edition, is the first of the series of Hummel’s superb arrangements of seven concertos — K466 in D minor. Not only will these scores throw light on the problem mentioned, but they will provide a unique opportunity for pianists to perform Mozart’s masterpieces with just a handful of friends or colleagues rather than with full orchestra, or even play them as solo works in their own right.