Greg, unless you find someone who is very familiar with Mozart's music- an authority, no less- finding the bit of melody again is, as I said, a needle in the haystack search. He wrote so many tuneful melodies and bits of melody (some borrowed from folk song or composed melody and developed into something else). Then again, if the melody is simple, it could just be coincidence. I have quite a bit of Mozart in my cd -lp collection, but it is only a fragment of his output.