“IMSLP, also known as the International Music Score Library Project or Petrucci Music Library, was started in 2006. The logo on the main page is a capital letter A. It was taken from the beginning of the very first printed book of music, the Harmonice Musices Odhecaton. It was published in Venice in 1501 by Ottaviano Petrucci, the library's namesake”. – (From “About” in home page).
“The site is governed by Canadian copyright law; not all available scores are in the public domain in the United States”. (From home page).
** Be careful about copyright and quality of the scores. Check the source, especially for older uploaded scores.
“Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more” –(from Home page).
- To look for scores do a combined subject/topic search and use “scores” as a description.