Many sources of online music scores have become available over the internet in recent years. Please be aware that copyright laws vary a great deal in different countries with regard to digitized works; take care to follow the laws that are relevant to your particular situation.
The website "Copyright Term and Public Domain in the United States" can serve as a starting place for determining the copyright situation for the materials you wish to use, but keep in mind that this only applies in the United States.
Any number of organizations, not-for-profit or for-profit, have started to make music scores available online.
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