The SemanticHIFI European project aims at designing and prototyping tomorrow’s Hi-fi systems, which will provide music lovers with innovative functions of access and manipulation of musical contents. The limitations of current equipments are mainly related to those of the music distribution media (album-based audio recordings in stereo format), with poor control features and interfaces (album/track selection, play, stop, volume, etc.). Enabling the manipulation of richer media and related metadata (either distributed with the audio recordings or computed by the user through dedicated indexing tools) opens a wide range of new functionalities : personal indexing and classification of music titles, content-based browsing in personal catalogues, browsing within titles with automatic segmentation and de-mixing tools, 3D audio rendering and assisted mixing features, etc. Moreover, the manipulation of interactive music contents will be made accessible to music consumers, through dedicated performing, and authoring tools. Last but not least, the users will then have the possibility of publishing and sharing their personal work with others, through a dedicated peer-to-peer sharing middleware specifically designed for preserving the rights of the used digital media.