biavati.net

Music sheet search engines

Indiana University:

http://www.dlib.indiana.edu/variations/scores/

Indiana University Library:

http://www.dlib.indiana.edu/collections/index.shtml

Free scores:

http://www.cpdl.org

PUBLIC DOMAIN CHORAL MUSIC:

http://www.cipoo.net

Opera Omnia Mozart:

http://dme.mozarteum.at

Digital Scores Collection

http://hcl.harvard.edu/libraries/loebmusic/collections/digital.html

International Music Score Library Project (IMSLP)

http://www.imslp.org/wiki/Main_Page