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In the complete edition of Clementi's pianoforte compositions this Sonata is published with the appended notice that Clementi played it to the Emperor Joseph II. when Mozart was present, in the year 1781. Mozart appears to have been fond of the theme, for he introduces a reminiscence of it into the first movement of his Symphony in D major, dating from the year 1786.

The first chorus in Mozart's 'Requiem' was evidently suggested by the first chorus in Handel's 'Funeral Anthem for Queen Caroline.' The motivo of both is however an old German dirge dating from the sixteenth century, which begins thus:—

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Wenn mein Stündlein vor-han-den ist,
und soll hinfahrn mein Stras-se.

and which may have been familiar to Mozart as well as to Handel.

The motivo of the Kyrie Eleison in Mozart's 'Requiem:'—