This project will develop an XML application defining a standard language for symbolic music representation. The language will be a meta-representation of music information for describing and processing said music information within a multi-layered environment, for achieving integration among structural, score, MIDI, and digital sound levels of representation. Furthermore, the proposed standard should integrate music representation with already defined and accepted common standards. The standard will be accepted by any kind of software dealing with music information, e.g. score editing, OMR systems, music performance, musical databases, and composition and musicological applications.