Dear all, I wholeheartedly suggest that you listen to Livio Gianola, a very innovative and in my opinion exceptional Italian composer and virtuoso. He also plays on an 8 strings guitar. There are many videos on youtube. He also wrote some fascinating and useful studies and excercises that can be purchased from his website. I do not have any associations with Gianola besides the fact that i love his music and his studies. Do check him out. http://liviogianolaliveconcerts.com/