Some days ago I have found (by a tweet from twitter) the following video of a Japanese mandolin orchestra:
じょんがら
(translation of the information from the video): guitars mandolin club. Omura, held at City Hall in May, has played up the 54th Music Festival Union High School in Nagasaki Prefecture. Was cut in half the time because it was 10 minutes. The latter half believes that in some circumstances.
In the meantime this video is no longer available.
With the help of google translation I found that this piece is titled Jongara, and so I have found another (and this time complete) version of Jongara, this time conducted by the composer Hiro Fujikake and played by the Japan Mandolin Union Orchestra and Hiro Fujikakes solo-orchestra (Hiro Fujikake plays several synthesizers):
JONGARA for Mandolin Orchestra : Hiro Fujikake
Concert live at Tokyo.
Hiro Fujikake composed and conducted Japan Mandolin Union Orchestra with Solo Orchestra.
I have found another version:
じょんがら抄 JONGARA-Syo
JONGARA-Syo, H. FUJIKAKE
LEVANTE Mandolin Orchestra 6th Concert in Morioka, JAPAN. 20th March 2011
Here is another version of Jongara by the Orkestra Mandolina Ljubljana.
Yasuo Kuwahara
There is another piece with the same titel Jongara for Solo-Mandolin, composed by Yasuo Kuwahara. Travis Finch – a student of Alison Stephens at the Trinity College of Music has recently played this piece during his final recital.