Please help identify this melody.

[John]

(I apologize if this is a duplicate post. I attempted to post this last week, but it never appeared from what I could see.)

For years I have had this tune in my head. I heard it a long time ago. This sample is just me pounding out what I could remember of it on a piano, but the piece, as I recall, was scored for strings. It had a baroque sound to it, and, if I recall correctly, it also modulated from major to minor and back, much like, say, one of the Brandenburgs (though, of course, it isn't from any of them).

I'd be so happy to just not wonder what this is. Thanks in advance.

https://soundcloud.com/friendly-person/mystery-melody