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Mozart thought out symphonies, quartets, even scenes from operas, entirely in his mind-often on a journey or perhaps while dealing with pressing problems- and then he transcribed them, in their completeness, onto paper.
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Beethoven wrote fragments of themes in note books which he kept beside him, working on and developing them over years. Often his first ideas were of a clumsiness which make scholars marvel how he could, at the end, have developed from them such miraculous results.
-A University Anthology for Overseas Students, pp.278-279