International Music Score Library Project

The International Music Score Library Project (IMSLP), also known as the Petrucci Music Library after publisher Ottaviano Petrucci, is a subscription-based digital library of public-domain music scores. The project uses MediaWiki software, and has uploaded more than 736,000 scores and 80,700 recordings by 1,900 performers of more than 226,000 works by 27,400 composers. IMSLP has both an iOS app and an Android app. Provided by Wikipedia