Here we go, cleaning up backlogged unanswered threads. This is a quick read, here are my thoughts:
First off, your image is from pixabay, which doesn't allow hotlinking (hence the generic placeholder image), and as such makes me think that you don't have rights to use it and as such the picture isn't compatible with the site's Creative Commons licensing. You'd need to find another picture or remove the current one.
The concept seems alright, if a little bland… I do like the backstory, but not everyone has the same perspective I do. Some small quibbles:
- Level 3 researchers > Level-3
- I'm not sure if you need to sub-designate every trumpet in the article.
- "When not being played, SCP-XXXX features no anomalous properties other than an increased" > I wouldn't use "features". Maybe "demonstrates"?
- "primary effect is activated whenever" > I'd use "manifests"
- "played. All nearby, man-made walls will begin to deteriorate" > start the sentence with "when this occurs, all…" and I don't think you need the comma.
- "for the duration that the note" > duration of time
- "question – SCP-XXXX will destroy" > I'd use a semicolon and not a dash, and "SCP-XXXX's effect"
- " a known cell of Are We Cool Yet?." > for newer readers, preface AWCY? with "anartist the Group of Interest" or the like
- "The band pitched the item as a way " > promoted, rather than pitched?
- "Following its unveiling, MTF Eta-11 (“Savage Beasts”) intercepted" > sounds like the MTF was unveiled
- " in-route to an anarchist" > en route
- "In this raid, all twenty-five" > during this
- "whom had ordinary trumpets" > non-anomalous
- "were amnetized" > amnesticized
- "canceled to due an unexpected military appearance" > I feel like that might have been hard to use to convince them? If they were protesting, a military appearance might have made them even more mad, yeah?
Otherwise, decently solid, I think. Get some more eyes on it though, maybe ask some AWCY? writers to see what they have to say about your portrayal of AWCY? here.