Cello Concerto in F, K206a, by Wolfgang Mozart in 1775. Where is it?! I remember seeing people post often that they wished Mozart wrote a cello concerto, but he actually did. The first 6 measures are still held at the Paris Bibl. Du Conservatoire, who supposedly had the whole thing as late as 1912. Nobody has found it since World War I. He also wrote more cello music, while in Donaueschingen in 1766 (?). They are even listed in the Köchel catalogue as "Solos for Cello, K33b".
It would seem Franz von Suppé wrote at least 2 symphonies, not speaking of concert or opera overtures. What's up with these? While the Mozart cello concerto may never be found, I'm not so sure about one or more of these symphonies. Maybe they're actually known somewhere, in some collection. Anybody know anything about these?
Litolff's Concerto Symphonique #1, didn't the manuscript burn up in the bombing of Leipzig? Did anyone make a copy of it that survives today? So far, apparently not... having a recording of #2 and #4, I regret this very much. Hyperion has released 2-5 on 2 discs now. #1 remains a goner.
Two Krommer symphonies have been written off as probably never to see the light of day again. He is known to have written 9, but we only get 7 today. I don't even think that all 7 of the survivors have been recorded, yet. Chandos has an exceptional recording of #2 and #4 (my favourite) in the Contemporaries of Mozart series.
So, where are the goodies? What else is missing that is sorely missed?