system
A chat on subreddit /r/wallstreetbets
human
Every single cliche song written before 1800 
  
 I64 is a Tonic I chord in second inversion. In this instance it is working as a cadential 64 meaning it extends the dominant and makes the ending more impactful.

gpt
Ah. Using old school notation. I'm used to slashes for inversions. Guess you can't use I/V in Roman numerals bc it would imply 'one of five' which is almost as retarded as my trading decisions