Orange County Library System Search page:
http://iii.ocls.info/
Orange County Arts Commission:
http://virtueofthesmall.com/old_sites/orangecoartscommission/links.htm
There are loads of links on this site:
http://www.at-la.com/@la-mus.htm
Online Resources:
Mutopia Project:
http://www.mutopiaproject.org/
Library of Congress:
http://www.loc.gov/rr/perform/
Online Music Library:
http://www.online-musiclibrary.com/
Great Performances - PBS:
http://www.pbs.org/wnet/gperf/
Smithsonian:
http://www.si.edu/Encyclopedia_SI/History_and_Culture/Music_History.htm
Project Gutenburg - Sheet Music:
http://www.gutenberg.org/wiki/Gutenberg:The_Sheet_Music_Project
Naxos Music Library (subscription):
http://www.naxosmusiclibrary.com/home.asp