Musical Scores and Sheet Music

International Music Score Library Project

US Library of Congress collection of sheet music in America

University of Indiana:

Encoding Musical Scores

Music Encoding Initiative -

Music XML - (Music XML - Sample -

TEI with Music

Music Libraries and Archives

Mozart's Letters

NY philharmonic archives

NYU American Institute for Verdi Studies -

Online Chopin Variorum Edition:

Carl Maria von Weber Gesamtausgabe (includes TEI encoded documents)