IMSLP is happy to accept submissions from users. These submissions must either be in the public domain or available under an approved license.
Any score or recording whose copyright has expired is eligible to be added to IMSLP.
For a guide to which works are in the public domain, please see Copyright Made Simple and (for a detailed explanation) Public Domain. Generally, items whose authors (composer, librettist, arranger) all died in 1971 or earlier can be submitted (since these items are in the public domain in Canada, where IMSLP's main server is located).
Any score or recording that you have created for either an original or a public-domain work is eligible to be added to IMSLP. (You can't submit editions, arrangements or recordings of ineligible works, however; for example, you can't submit a transcription of a work by a contemporary composer who has not given permission.)
Any item that is available under a free license (see our rules), such as CC BY or CC BY-SA, or dedicated to the public domain by its author, may also be uploaded.
You need to be a registered user to upload items. Registration is free. If you have an account, you need to log in. If you don't have an account, create an account.
Use the search function to find the composer's page. (If you are adding an arrangement, search for the name of the composer who wrote the piece the arrangement is based on.)
If the composer has a page, continue. If the composer does not have a page, you can create a new composer page. (If you're uploading your own compositions, you'll need to create a page for yourself.) Before creating a new composer page, remember to:
If the item you want to add has a named editor, librettist or arranger (including if you are an editor or arranger), make sure that profiles exist for all those people. If one doesn't exist, create one. (Note that "Add Composer" is used to add profiles for arrangers, editors, librettists, etc. as well.)
When entering the name of an editor, librettist or arranger in the appropriate field, use the following format to link to that person's profile:
(If a person is still living, or the birth/death year is unknown, leave a blank space in that field.)
On the composer's page, find the page for the right work (or use the search function to find the work). Remember that a work may have multiple names; even so, the files must go on the same work page. (Example: Die Zauberflöte is the original German title for The Magic Flute.)
If the work page does not exist, click the menu option to create a new page for that work.
Once you are on the work page, use the "Add File" menu to add your files. Note that the "New"/"Your Own" options ("New Edition"/"Your Own Edition") should be selected for adding files you created yourself.
If your files are indeed eligible to be added to IMSLP, a copyright reviewer will approve your file. This may take between a few hours and a few days. If there are any problems, you will be contacted by a reviewer.