I believe I commented on the draft version of this, but since it's fallen to page 3 with no replies, I'll post here as well..
The SCP is a baby grand piano that is sentient to an unknown degree.
How is it observably sentient? Why does it need to be sentient?
When played it pacifies all entities surrounding it including some SCPs.
Too convenient. As such, boring because there isn't really much room for anything besides the predictable "it calms things down and they get along forever and everyone's happy" story. Also, I'm having a hard time believing that the Foundation would just test this with SCP objects so often.
Those affected will become friendly towards one another and after the effect has long passed affected have a good relationship with each other.
Sort of like a lowkey version of Cupid's love/affection arrows from Greek Mythology, torlin kerru/"justice-fairness mushrooms" from Gail Carson Levine's Ella Enchanted, and probably a bunch of other things that exist already in popular media as kinda-contrived plot devices.
Why is this thing so powerful?
