The International Day of Provenance Research has been taking place annually on the second Wednesday in April since 2019. It’s an occasion for various activities ranging from lectures to guided tours of museums, collections, and libraries and on to the publication of scholarly essays in the blog Retour. 8 April of this year saw the mdw participate in this day’s observance for the first time, doing so with a dedicated event and the opening of the permanent exhibition Stolen Melodies – Provenance Research at the ub.mdw in the open stacks of the mdw’ University Library (ub.mdw).