I just grabbed a CD that I've had for getting on for ten years -- one of the Dillons Classics. It claims, on the liner and on the disk itself, to be Mozart's symphonies 35 and 36. The computer, though, insists that it's Bach's Brandenburg Concertos 1-3. What's more, that's exactly what it sounds like.
How on earth did I miss that all those years?
Dillons was a UK bookstore chain, long since devoured by Waterstones. For a while in the 1990s, they had their own CD label, specializing in low-priced reproductions of classical favourites performed by mostly Eastern European orchestras. I collected quite a number of them, as the otherwise fairly useless branch at the London college where I worked kept a spinner of them in the corner. The label art is murky and undistinguished, and I suppose it's possible that I never actually listened to this one before, but it seems unlikely.