The Muzio Clementi reference article from the English Wikipedia on 24-Apr-2004
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Muzio Clementi

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Muzio Clementi 1752, Rome - 1832, Evesham (England). Classical composer, and acknowledged as the first to write specifically for the piano.

Best known for his collection of piano studies, Gradus ad Parnassum, to which Debussy's piece Doctor Gradus ad Parnassum makes playful allusion.

Mozart held an inexplicable dislike for Clementi (and perhaps Italians in general), which has led some to call them "arch rivals." However, this distinction would not be correct, because Clementi himself does not seem to have reciprocated Mozart's feelings.

The pianist Vladimir Horowitz developed a special fondness for Clementi's work, comparing some of them to the best works of Beethoven. The restoration of Clementi's image as an artist to be taken seriously is not least due to his efforts.