Sheet Music
Early Music Archive-- http://ace.acadiau.ca/score/archive/ftp.htm
Guide to Classical Music Publishers-- http://www.webcom.com/musics/catalogs.html
Guide to Sheet Music Collections-- http://www.arts-accredit.org/nasm/nasm.htm
Historic American Sheet Music (Duke University)-- http://scriptorium.lib.duke.edu/sheetmusic/
International Database of Choral Repertoire-- http://musicanet.org/en/search.htm
Music for the Nation - American Sheet Music (Library of Congress)-- http://memory.loc.gov/ammem/smhtml/smhome.html
Score On-line-- http://www.score-on-line.com/