Margaret Mikulska (and several others evaluating Beethoven biographies)
wrote:

>Thayer-Forbes is still quite serviceable, although out-of-date.

How out of date can a biography of Beethoven (who died in 1827 after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? How
much significant information on Beethoven could researchers have discovered
in the last 34 years that had remained unknown for the previous 140?

Walter Meyer