I've always called this the Androphonovania loop, and that's because I first heard this way of looping the song in the 2nd phase of the (unofficial) TS! Underswap Papyrus fight. (I only uploaded this again so I could loop it this way).
The reason the colours on his sweater are inverted is because it's supposed to be the red swapped with the white, like I swapped phase 1 & 2's melodies.
The reason the colours on his sweater are inverted is because it's supposed to be the red swapped with the white, like I swapped phase 1 & 2's melodies.