A handwritten sheet with music is a manuscript. It follows the text on manuscripts: flat, acid-free, dark, origin written down, nothing glued to the sheet. In the overview Security for collectors the only difference is that musicians like to frame them. The frame in the sun is the damage.

When someone comes

Light, it looks like paper. The documented sheet stays in the document safe. A copy may lie on the piano that belongs with the grand piano. The original does not.

The folder

Composer as far as documented, work, extent, origin, proof, photo. Without proof you do not write "attributed" as a fact.