This document summarizes a project that models music metadata in semantic graphs to improve music description and foster music exchange. The project aims to connect different music data sources, enrich the user experience, and make vocabularies and data publicly available as linked open data. The project develops a music-specific data model and tools for visualization, recommendation, and other applications. State-of-the-art music ontologies are extended and complex metadata from different sources is converted and interlinked using controlled vocabularies and natural language processing.