Per 
Item #: SCP ####
Object Class: Safe
Special Containment Procedures: SCP #### is to be kept in its (non anomalous) case in a small item standard containment locker. Permission for testing with SCP #### requires approval from relevant personnel of Security Level 3 or higher.
Description: SCP #### is a 120 mm brandless disc. On the back, "AB(S)CD" is written in black sharpie, stylized to resemble the logo of the band AC/DC. The CD, when recovered, was found near a similarly generic CD holder with a white cover on which the "AB(S)CD" "logo" was drawn. This holder has demonstrated no anomalous properties, but has been kept and used for containment of the disc.
SCP #### has proven very difficult to harm or destroy through various testings. The CD cannot be read by computers and can only be played by an appropriately sized CD player activated by a human.
When activated, a song will begin to play. At this point, the CD player it is in will become indestructible, and no attempt to stop the music from playing will succeed. Unplugging of headphones or the machine itself, attempts to pause or eject the disc, and attempts to destroy the machine have all met with failure in various experiments.
When SCP #### is activated, it will play a song the person who pressed play (temporarily designated SCP ####-L) both knows and hates. Other listeners nearby will hear the same song as ####-L, but will not experience any anomalous effects just by listening. Following the song's completion, SCP #### is possible to eject, and the CD player becomes vulnerable to damage again. However, immediately following the end of the song, ####-L will enter an altered state of mind, the specifics of which are determined by the song listened to. This state lasts exactly one hour, after which ####-L will return to their baseline behaviors. The former SCP ####-L retains full memories of their actions, but feels very little connection to/responsibility for them. No lasting effects have been recorded beyond typical confusion and irritation.
Addendum ####-A: Test logs. Overseen by Researcher Queue and Security Officer Cue.
####-L: Designation of the listener, including any salient information about their musical tastes or current circumstances.
Song Played: The name of the song and its singer, if identifiable. Any unusual reactions during the playing of the song may be listed here.
Altered State: Description of the altered state of mind into which the listener entered after the conclusion of the song.
####-L: D-1281. Noted to favor heavy metal music. Grew up in the southern United States.
Song Played: Simple Man, by Lynyrd Skynyrd.
Altered State: Subject calmed down immediately upon the conclusion of the song, and for the next hour spoke with a pronounced drawl, lauding and having seemingly adopted the values espoused in the song itself. After the altered state ended, subject requested that all recordings of this incident be destroyed. Request was denied.
####-L: D-972. Deaf from birth.
Song Played: CD player failed to play. D-972 reported no unusual stimuli, auditory or otherwise.
Altered State: n/a
Note: Later tests showed that it also failed to produce any music for people made deaf later in life, so it's not just a lack of a disliked song. It won't play for an audience that can't physically hear it. -Researcher Queue
####-L: D-2663. Ordered to pretend to be enjoying the song, no matter what played.
Song Played: We Can't Stop by Miley Cyrus. Subject expressed initial annoyance, but when reminded of his orders, pretended unconvincingly to be enjoying the music
Altered State: Subject began acting as though he was at a rave or house party. After some mild destruction of foundation property, subject was restrained. Even when restrained and left alone in a dark room, subject continued to act as though he was "partying" until the effect wore off.
Note: Later attempts made with better actors yielded similar results. Seems like this thing can't be fooled. Which is a shame, I was kind of hoping it was both sentient and stupid. -Researcher Queue
####-L: D-1874. Given permission to leave the room if the song was not to her liking.
Song Played: Yodel-Adle-Eedle-Idle-Oo, from the movie Home on the Range. Despite expressing great displeasure, D-1874 did not leave the room and expressed a lack of desire to do so when prompted.
Altered State: Subject proceeded to yodel loudly for an hour after the song stopped. Was shown to do so with much greater skill than that of an amateur, but the yodeling did not seem to have any hypnotic effect on researchers. Testing on cows was not able to be done in a timely manner.
Note: Attempts to manually put noise cancelling headphones on someone's head while they're listening have failed. We may have to get a bit more physical… -Security Officer Cue
####-L: D-1113. Unusually physically weak.
Song Played: Photograph, by Nickelback. After expressing his displeasure at the song, D-1113 was forcefully removed from earshot of the player by Security Officer Cue. D-1113 resisted heavily until the song ended, but could not adequately explain why. Song still played all the way through even without the presence of ####-L.
Altered State: Altered state was unusually brief, approximately one fifth the length of a normal Altered state. This matches up with the duration of the song which D-1113 was believed to actually hear. D-1113 showed intense fascination for and was deeply enamored by photographs for approximately twelve minutes. For the next 48, he lost his fascination with pictures, but showed unusually high levels of confusion before returning to his proper baseline an hour after the song ended.
####-L: D-2315.
Song Played: Mrs. Officer by Lil Wayne.
Altered State: Subject became extremely flirtatious with (notably female) Security Officer Cue. After being percussively tranquilized, subject awoke an hour and 30 minutes later in a normal state of mind and apologized for previous behavior.
Note: Well, now we know that being conscious is not a prerequisite for running out the timer on the altered state of mind. Useful information. Still, let's try to avoid future near concussions, shall we? -Researcher Queue
####-L: Researcher Queue. Currently raising a pair of two year olds. Tricked into initiating this test by Security Officer Cue.
Song Played: Teletubbies theme song.
Altered State: Following the end of the song, Researcher Queue spoke in a childish voice and affected British accent, insisting that it was "time for teletubbies" and searching for the characters on the show. Upon the end of the altered state of mind, Security Officer Cue was reprimanded for lack of professionalism.
Note: Someday, sis. Revenge. -Researcher Queue
####-L: D-1679. Notably a nonviolent offender.
Song Played: Kill EVERYBODY by Skrillex.
Altered State: Upon the end of the song, the ####-L suddenly went quiet. For a number of seconds, she did not respond to questions or requests for information. After approximately ten seconds of silence, she suddenly broke free of containment, exhibiting greater strength brought about by a lack of inhibition and seeming lack of reaction to pain. Multiple researchers were attacked and injured, though quick actions by multiple security personnel prevented any casualties. After being restrained for an hour, upon coming out of her altered state of mind, D-1679 passed out from the pain and required 4 months for recovery from self sustained injuries. Testing concluded.
