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 digital library of public-domain music scores, available either as a subscription-based service or free without registering. The project uses MediaWiki software, and as of 24 November 2023 had uploaded more than 736,000 scores and 80,700 recordings by 1,900 performers of more than 226,000 works by 27,400 composers.

Source: Wikipedia — International Music Score Library Project (CC BY-SA 4.0)