Archives and collections are increasingly making an effort to not only document the past but also to make their stock of material available for people to revive and experience, for the purposes of artistic- and knowledge creation. However, granting access to archival material implicates many legally and historically sensitive issues: What sort of tasks, what responsibilities do archives as well as archive-remixers have regarding provenance research, participation and accessibility? What practical examples are there for how to release the tension between reactivation and original context, reuse and author rights? What role does the immaterial character of music and sound play here? In what way can archival work become a commons-building exercise?