I thought it was really getting time for this thread, I put it here because to would really like to start with the New Music perspective, since it is easier to Do an objective analysis, obviously it will include improvised music as well. I own the scores to Druckman's "Valentine", the Scelsi solos, the Xenakis, Barry Guy's Statements II, Turetzky's book and many others. I also have some of Dresser's charts on harmonics and bitones. These scores include some of the basics: Circular bowing, Double Glissandos, playing with a mallet or other percussion item, etc. We know that the 16th century composer Biber had the double bass prepared with paper and played Col Lengo to produce a snare drum effect. Obviously, personal experiment produes a lot and finding the music in the these sounds is the utimate goal. Before listing down my experience I'd like open it up just to get away from the "Play your bass with a nail" discussion.