So Whoever Heard of Johannes Matthias Sperger?

I certainly don't recall the name--though, doubtlessly, Dr. Burney did mention him.  The problem with having read Dr. Charles  Burney [shown here above the morning star in his doctoral gown, in the wonderful speaking likeness by Sir Joshua Reynolds, painted in 1781], even in his entirety (as I believe I may have done), is that Dr. Burney mentions everybody--and all so engagingly, justly, compendiously, like a perfect host who would be mortified to forget anybody, in what may be the most delectable expository prose I have ever read.  I consider myself fortunate (nay, bless'd) to've retained as much as I have, with no subsequent reminder, of Jomelli, Saari, Nardini.  My present complacent ignorance of the Bohemian-born near-contemporary of Mozart, contra-bassist and, even for his day, exceptionally prolific composer, Johannes Matthias Sperger (1750 -- 1812 Would that Mozart had lived so long!), damnable though it be, is understandable without my having heard examples of his work to enlighten it.  Well, I've just heard an example--one of Sperger's many symphonies, conducted by (who else? Harnoncourt)--and a perfect jewel it was and is.  Never more shall I forget the name Johannes Matthias Sperger (mnemonic device: like the classifier of the mental affliction, without the alpha-privative).