SCP-012 is an object contained by the fictional SCP Foundation.

SCP-012, also known as “A Bad Composition” is a piece of sheet music in which the musical notation/score is written in blood. It has the paranormal effect of making anyone who views it feel compelled to use their own blood to complete the uncompleted parts of the piece, eventually leading to death due to blood loss.

For a more in-depth explanation of this object, follow this link to read the original article: https://scp-wiki.wikidot.com/scp-012