Here's a piece I have had in my collection for many years; as a good short practice piece. It's by Mr. Vivaldi again; a very short little theme, followed by a couple of variations.. equally as brief in themselves. [ I improvised some chords here and there.] All the typical dynamics of Vivaldi encapsulated in it; and yet it is quite playable.. Ending with a typical semi-quaver rush at the close! Attached is scan of the music page itself [I copied original over 2 decades ago - from a flute book.]