In a lot of jurisdictions, the same goes for the actual sheet music. Even a lot of facsimile editions - literally photos- of the sheet music claim copyright to the "creative work" embedded in making the photo.
The result being that in many jurisdictions, you'll have difficulties finding public domain sheet music of obviously public domain music for which it is clear (the longest living) composer died over 70 years ago.
The result being that in many jurisdictions, you'll have difficulties finding public domain sheet music of obviously public domain music for which it is clear (the longest living) composer died over 70 years ago.