Petrucci Music Library: Free Public Domain Sheet Music. Online Music Scores. [These links include only sites with scores that may be downloaded free of charge.]
General Collections [Other General Collections] [ M–W ]abc collections [music scores in abc format only (require abc software to view or print)]Biblioteca Virtual de Partituras / Virtual Library of Music Scores (Zoltan Paulinyi) [Text in Portugese and English. Scores in various formats, including Adobe Acrobat Reader PDF, PostScript, Finale, Sibelius, GIF, Encore; some MIDI; and some facsimiles. Composers include various Brazilian composers, Ligeti, A. Mario the Music.