It seems many people here don't like Mozart.
Just like it has already been suggested, I think they should try to hear some of his less "mainstream" works. [MENTION=3325]Mole[/MENTION] said Mozart only composed music, and this is true in the way that Mozart was a "natural" composer, who could translate almost effortlessly and almost instantly his current emotional state into music. It's exactly like if music was his first, "natural" language, before his native tongue, German. Thus, I'd consider his more intimate works not only to be his best works, but also the most revolutionary.
Take for instance his Fantasias, either the one in D minor (K397) or the other in C Minor (K475). They follow no pre-ordered structure, it's impossible to guess what will be next, it's totally unpredictable. And you have those sudden silences. All the deep conflicts that permeated Mozart's mind are here... a deep sadness and melancholy followed by the recollection of joyful moments spent with his mother, and all, in less than 5 minutes. It's exactly like if we were following Mozart's own complex stream of thoughts, it's like being directly linked to his mind.
Nobody ever made music like this before. The first persons that heard that were astounded, if not perplexed. It's like a continuous improvisation with sudden key changes every thirty seconds, but put to an incredible degree of sophistication, richness and inner variations.
And nobody ever made music like this after him, even if Beethoven tried several times to imitate his genius sometimes.
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Here is the version played by that dear Claudio Arrau and his famous "velvet paw"...
Or the fantasia in D minor (by Walter Gieseking), one of the most disturbing and surprising piece of music ever written...
I have memories of my father playing both of them on the piano. I also tried it, but playing Mozart is way more difficult than it seems: despite the relatively slow pace, each note has to be played perfectly; the paradox is that the fast movements are comparatively easier to interpret. And you have to be in the mood for it, because of the huge emotional content. Playing Mozart can leave you exhausted, not something I could do everyday or on command.