The vision of the Semantic Web is to lift the current Web into semantic repositories where heterogeneous data can be queried and different services can be mashed up. Ontology or agreed consensus is the key issue to achieve that. We present the EASAIER (Enabling Access to Sound Archives through Integration, Enrichment and Retrieval ) Semantic Music Retrieval Portal, a prototype application that allows the integration of audio-related metadata according to the Music Ontology. This builds the foundation for semantic search over natively heterogeneous sources and services.