Can someone tell me what this song is??

If you cannot hear the tune in question playing on your computer right now... either turn up your volume or try to download it from the link at the bottom. I believe this is Vivaldi. But... from what?

If you would, please listen and if you can, please let me know the title of this. Also, if you could suggest a great recording of it, that would be a big help.

Song in Question

Thanks for the help!!