| I work for IMSLP. I am working on adding new scores, but in many cases these old things are either the only editions published or the only editions we can take. IMSLP accepts urtext editions over 25 years old. We have a good amount of these from series for the most famous composers (e.g., Mozart, Bach...) but these are only a minority of the collection. We of course would like to add more. Otherwise, for "original" editorial editions, as well as arrangements, etc., we take them so long as the contributors of original creative contributors died in 1971 or earlier, or, as the case may be with amateur editions, with permission (note: we actually do have a significant number of quite good editions/arrangements contributed with permission, but we have a lot of files on the site overall). The other thing is, since we draw from many existing digitizations (such as national libraries), and most of their digitized documents are quite old. If you have any particular requests, please add them to the wishlist: https://imslp.org/wiki/Wishlist Anyway, we are not really like Wikipedia, since we have a great deal of those primary sources on our site (incl. many autograph mss., as well as historical editions), and we're fundamentally more a collection of sources than a synthesis of them like WP. But we are certainly not a complete collection of sources, by any means (for both practical and legal reasons). |