Most are arranged for an ensemble (Violin, Flute, Oboe and Clarinet).
I know the bottom of pages of the site say they are licensed as CC Share-Alike, but I've updated most of the pieces footers to release them back into Public Domain.
I won't be getting to them right away, as I have some tasks to do outside the wiki, but don't let me forget. Feel free to put up any articles you want beforehand. Just use the code from some existing article as a model. If you have any questions, just ask.