The International Music Score Library Project was a repository of more than 15,000 musical scores that are in the public domain here in Canada. I was forced to close the site due to circumstance after receiving lawsuit threats from music publishers that do not want the public domain to exist. The immediate threat was from Universal Edition, a publisher in Austria. Whereas copyright in Canada lasts until 50 years after the author's death, copyright in Austria lasts 20 years longer. Universal Edition threatened to sue me, perhaps in Canada or perhaps in Austria, for violating Austrian law. There is no reason why Austrian law should apply to this site in Canada, but as a student I did not have the resources to resist even an absurd threat from a company with money to pay lawyers to attack music. from: imslp.wikidot.com

The IMSLP is hopefully going to be back online soon. Such an invaluable resource for music study.