Walter Meyer wrote:
>How out of date can a biography of Beethoven (who died in 1827 after
>having lived a relatively open life), which was revised in 1967, be?
Very. But it's still worth reading.
>How much significant information on Beethoven could researchers have
>discovered in the last 34 years that had remained unknown for the previous
>140?
A great lot. The last few decades brought a lot of changes in musicology,
including research in two areas that were practically unknown before:
paper type and watermarks and the importance of non-autograph manuscripts
made by professional copyists. Both are very important for the research
on dating and authenticity of works.
-Margaret Mikulska
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