A relatively recent phenomenon, advanced Sibelius scholarship is still in its earliest phases. Before the currently available editions of the works can be properly assessed and ‘critical editions’ prepared, when needed – not to mention more complete collections of the letters, diary entries, and so on – a wealth of data scattered in various cities still needs to be uncovered, inventoried, and made accessible. In addition to Erik Tawaststjerna's monumental biography, the central coordinating document of virtually all current thought on the composer, two important recent publications from Finnish scholars have continued the advancing trend of ground-level Sibelius scholarship. Fabian Dahlström's catalogue from 1987, The Works of Jean Sibelius, includes much publication and first-performance information. And Kari Kilpeläinen's impressive catalogue from 1991, The Jean Sibelius Musical Manuscripts at Helsinki University Library, inventories the largest collection of Sibelius sketches, drafts, early versions, and fair copies in the world. Much (but by no means all) of this huge collection was originally Sibelius's own, accumulated throughout his entire life. These personal manuscripts eventually passed into family hands and thence, in 1982, into the Helsinki University Library. Dahlström's current project at the Sibelius Museum in Turku is the production of an expansive thematic catalogue, which will also provide an overview of the principal printed and manuscript sources of the works.