Most Bachido members probably bump into this instrument at some point, so decided to jot down some notes.
The biwa is a japanese plucked instrument related to the shamisen. Based on the chinese pipa, it was introduced to Japan in the 6th century and a number of the classical traditions survived intact to the 20th century. There was a good deal of influence back and forth between the biwa and shamisen over the centuries. http://en.wikipedia.org/wiki/Biwa
The biwa could be interesting not just because of historical connection but also because of the playing techniques. Possibly something could be developed as an experimental technique on the shamisen, but there are also marked differences so many things probably won’t work at all. There are some superficial similarities too, I noticed the upstroke is common on biwa as well.
A couple of videos that show nice technique - both are a very classical subject for biwa music, from the Heike Monogatari, though the instruments are a common type (satsuma biwa both?) on the modern day:
On this one, the actual playing starts around 3:00: