Here is the link to the video, made by Leo Gach a zithercomposer from Austria.
Performed by Doris Weberhofer(all four voices).
You hear Orange Garden in the copy for Zitherquartett (3Diskant- and 1 Altzither)

http://www.youtube.com/watch?v=qr-4cUFzRCQ

Here is the link to the composeres homepage

http://www.liveklang.at/

Marvellous! Thank you!