“Okay,” Vinyl began. “So, I made this sound deck which repeats things using tape loops, and then this one takes that, transcribes it onto a record, then reads it off straight away just to get the purely authentic crackle, and this one will constantly monitor the results from the unbiased point of view of a purely mathematical algorithm dedicated to finding better music, and this one-”
“I get the point,” Octavia interrupted. “It plays great music. Right. What happens if you switch it all on?”
Seeing Vinyl glance over at the controls, Octavia gestured. “Go on, I'm honestly curious now.”
“Well... sure.” Vinyl tapped a few switches, then moved the power control to on.
The whole edifice creaked for a few seconds, then began to produce sound.
“...well, it's very nice,” Octavia said, after a few minutes. “But what's a submarine, why is it yellow, and who are all living in it?”
Vinyl gave her new machine a scowl. “I'm going to need to give this thing another look over.”
It certainly wasn't supposed to just play Beatles hits, and she hadn't worked out how to stop it yet...
https://www.fimfiction.net/story/98568/115/mlp-time-loops/mlp-loops-109