Had Haydn died at 35 he would have left only 14 keyboard sonatas and a couple of other pieces, none of them anywhere as momentous as Mozart's finest sonatas.
Mozart wrote concertos mostly for himself to play at concerts at which he could dazzle his public. Sonatas were not in those days performed in public - he wrote them to publish and sell to the amateur market and was more than once asked to produce 'easy' pieces which would sell readily. The fact that he was constitutionally incapable of doing this (see the notoriously tricky K576/i) does not affect the general case. That said, I'm very fond of a number of the sonatas and think that in general they have had a bad press, perhaps aided by indifferent performances.



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. It's not a competion, after all...
