Excellent! Could have been played after dinner at court with Joseph II. I would get in trouble, throwing some whole tone chord in or 20th-21st Century surprise of some sort! This has a great purity but also sense of humor about it. I haven't listened to the middle movements YET, but I'm sure they measure up. Reading your comment just above about the oboe getting off on the wrong stop and having to get back to key...I do that all the time. It reminds me of when I'm playing bass to my brother's guitar, covering classic rock, and we go into a jam...and train wreck, or near train wreck, but we chromatically wrench it back into key...there's a part in the piano sonata I'm working on that does this sort of thing, many parts, actually, but one in particular. Your last movement Presto does this well and sounds like something Wolfie might have done; perhaps in a fantasia or musical joke?😉 Oh yes, I realized why it had to be in Bb!