How about a super-optimizing hyper-intelligent AI with "hyperspace effectors" from the Culture books? Make it the "Mind" who was shunned as a pervert, because h

How about a super-optimizing hyper-intelligent AI with "hyperspace effectors" from the Culture books? Make it the "Mind" who was shunned as a pervert, because he liked to mess with sentients. We'll call him "MeatFracker." Perhaps a "concert" from MF could be billed as a new kind of experience, where MF scans the brains of the listeners to determine the best sounds to play. What's more, MF could conduct experiments, determine the best phrase out of several, then "rewind" the brains of the audience so that everyone only remembers hearing the best phrase. This process is then iterated over the entire "set" of compositions. The concert would take longer than the audience's subjective experience of the time. However, the audience would likely be left in tears and speechless, saying the experience was timeless and indescribable. As a meta joke, years later, he could confess to not actually having gone through with the above process, and instead say he used remote brain manipulations equivalent to injecting the audience with LSD while playing Nickleback.