IMSLP has added a membership plan. All scores will still be available for free to non-subscribers.
For an overview of the membership plan see IMSLP:Membership Q&A.
For more information on the reasons behind this change, see this announcement on the IMSLP Forums.
Please note that some newly-uploaded scores may only be available after a day or two to non-subscribers.
Free public domain sheet music from IMSLP / Petrucci Music Library
These are scores using unconventional notation, graphic notation, aleatoric notation, indeterminate notation, or notation for electronic music, and this notation is a more important part of the composition than the traditional notation elements.
Pages in category "Graphic scores"
The following 17 pages are in this category, out of 17 total.