this sort of reference list is essential.Fun to explore - do your own searches!
http://memory.loc.gov/ammem/award97/ncdhtml/
http://levysheetmusic.mse.jhu.edu/
http://www.bandmusicpdf.org/
http://digital.library.ucla.edu/sheetmusic/
http://webapp1.dlib.indiana.edu/inharmony/welcome.do
http://odin.indstate.edu/about/units/rb ... itles.html
http://oregondigital.org/digcol/sheetmusic/
http://library.duke.edu/digitalcollections/
http://digitalgallery.nypl.org/nypldigital/
http://www.nla.gov.au/digicoll/music.html - Australia
http://ucblibraries.colorado.edu/music/smp/index.htm - U. Colorado
http://digital.library.msstate.edu/coll ... browse.php - Mississippi State U.
http://www.hezzie.com/lr/kk/kksongfoliocover.html - Hoosier Hot Shots
http://kids.niehs.nih.gov/music.htm#index Kids' Sing-along
http://www.jazz-on-line.com/index.htm- Old Time Jazz On-line (MP3 files, not sheet music)
http://www.negrospirituals.com/news-song/index.htm - Lyrics for Spirituals
http://cyberhymnal.org/ - NetHymnal (lyrics, MIDI files, scores)
http://www.prjc.org/tjen/resources.htm - Trad Jazz Educators Network (links to arrangements)
http://www.sjlibrary.org/research/speci ... ex.htm?t=2 - San Jose, CA library
http://www.wikifonia.org/node/2571 - Wikifonia Leadsheets
http://libweb.lib.buffalo.edu/ml/fakebooksearch.asp - Index to 100 Fakebooks at U. Buffalo
http://www.mudcat.org/ - folk songs and other old-timey sorts of things.