Dear Peter,
I can't help but smile when you refer to the 'Mozart Requiem' by saying of Gottfried Weber - 'Stadler successfully countered his claims'.
You are not to blame for this quite absurd view being held so widely. But let me correct you on at least a few points.
Stadler (a liar and a rogue) can be shown to be a liar and a rogue in respect of 'Mozart's Requiem' on so many grounds that your bandwidth would be exceeded if I did the subject justice.
In a nutshell, it was Abbe Stadler who, during Beethoven's last years, published a poorly structured and highly dubious article entitled 'In Defence of the Requiem' that has, since its appearance in 1826 been a monument to absurdity and to the gullibility of most people on these issues. Stadler's work of that name was written to counter a detailed and technical article written by the great editor of the leading musical journal of Germany at that time, 'Caelicia' whose editor was the same brilliant scholar Gottfried Weber - a Gottfried Weber who had, forensically destroyed the credibility of those who argued that Mozart wrote the Requiem of his (alleged) authorship.
Weber's article of 1825 was the first detailed expose of dirty tricks in the Requiem affair. He showed that Sussmayr had lied, publicly, in print, as to the amount of work he, Sussmayr, had supposedly done on the piece. He showed, stylistically, that this piece by 'Mozart' was gravely flawed in its content and style, that it contained whole sections that were supposedly by Mozart but which, in fact, were not. He showed, musically, that this piece was NOT by Mozart. And he did so on grounds that you or I or any member of this forum would agree are devastating to the emerging 'Mozart industry'.
But, since you believe that Beethoven knew best, let me just give one small example of the skullduggery in this affair.
We have contradictions by the thousand in the official version of Mozart's suppsosed Requiem. Let me just give one from hundreds - one of the few that specifically ties together Constanze Mozart, Sussmayr and Stadler. (Then you can easily see at a glance why Stadler is a liar and a rogue).
In his 'Defence of the Requiem' Stadler claims in writing that the piece (the Requiem) was in a state of virtual completion at the time of Mozart's death in December of 1791. That is a bald faced lie. But it's a bald faced lie that, many years before, Constanze Mozart gave, also in writing. For (as every single student knows) the manuscript of KV626 contains entire passages that were NOT by Mozart - and we had Sussmayr himself claiming to have composed huge sections of it himself !!! But this lie about the state of KV626 is but one of dozens found in Stadler's 'Defence of the Requiem'. How this rubbish can be portrayed as a vindication of Stadler and of 'Mozart's Requiem' is truly laughable. The work Stadler wrote in 1826 is schoolboy stuff in comaprison to that provided by Gottfried Weber in the year before.
Let me end here only by pointing out that, in the 1820's nobody yet knew (let alone Beethoven) that this manuscript of KV626 contained (as it still does) an inscription by Mozart saying that he, Mozart, had written it, and had dated it in his own hand. A fact so compelling for Mozart enthusiasts were it not for the fact that this inscription and signature was proved a forgery only long after Stadler, Beethoven, Constanze Mozart, Sussmayr etc. were long dead. Had Gottfried Weber (or even the great Beethoven) known of this piece what we know today he would have thrown a bowl of soup at the jackass Stadler.
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