SCP-1860 is a malnourished humanoid entity of 2.1 meters in height.
Why aren't we feeding it? Can it be malnourished if it doesn't eat? Do you maybe mean 'emaciated'?
to create the material's paper
To create the material's material? To make the paper's paper? Redundancy bugs me.
The source of SCP-1860-1 appears to leak out of microscopic orifices below its waistline.
Either "The source appears to be" or "The material appears to leak". A source cannot leak out of an orifice.
This usually includes only musical notation
So does it "usually include musical notation" or "include only musical notation"? You can't have both.
suspend these forms at 0.6 meters above ground, where it orbits them in a clockwise motion around itself.
Earth does not orbit The Moon around itself. The Moon orbits around Earth.
if called for in the music sung
Sung is the past perfect tense and requires a helper verb. Three ways to fix this. 1. "if called for by the music it is singing." 2. "If called for by the music it has sung." 3. "If called for by the music sang."
There does not to seem any underlying relationships regarding the choice of music
Either "Do not seem to be relationships" or "Does not seem to be any relationship".
Forensics have determined
Same tense confusion. Either "Forensics (a collective singular for either a set of actions or a department) has determined" or "Forensic Agents (a plural) have determined"
Three personnel suffered hearing loss, which brung about the addition of sound-cancelling material into SCP-1860's containment chamber.
"Sing" (present), "Sang" (past), and "Sung" (past perfect) are all correct forms. So are "Ring", "Rang", and "Rung". But in this case it's "Bring", "Brought", and "Brought". "Brung" is not a word.
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