The International Music Score Library Project (IMSLP), also known as the Petrucci Music Library after publisher Ottaviano Petrucci, is a subscription-based project for the creation of a virtual library of public domain music scores, based on the wiki principle. Since its launch on February 16, 2006, over 370,000 scores and 42,000 recordings for over 110,000 works by over 14,000 composers have been uploaded. The project uses MediaWiki software to provide contributors with a familiar interface. Since June 6, 2010, IMSLP has also included public domain and licensed recordings in its scope, to allow for study by ear.