Folklore
The American Folklife Center - http://www.loc.gov/folklife/
Aims to preserve and present the great heritage of American folklife through programs of research, documentation, archival preservation, reference service, live performance, exhibition, publication, and training.
Humboldt Folklife Society - http://www.humboldtfolklife.org/
A group of dedicated volunteers who love music, mostly folk music, but certainly not exclusively.