For many the fortepiano is an unfamiliar soundworld, but it just might help us hear Mozart’s genius afresh.

As a Mozart specialist, do you agree with Glenn Gould, who famously said that Mozart died too late rather than too early, that all his best piano works were written before he was 25?

Not really. One has to be sensitive to the fact that Mozart wrote what was required of him. Mozart was not the kind of stereotypical 19th-century composer who writes for himself and himself only, and occasionally does something for someone else. Mozart writes for very specific purposes, and for every purpose he does things perfectly – that is his genius. The piano concerto is his most selfish genre, because it is really only for himself. So he...