Huh. Mildly relatable. The one time I was on nitrous oxide as a kid was when I needed to have part of my finger sown back on (me and a friend having been given pocket knives for our birthday and having exercised not quite enough caution, because we were like, 8? 9?. Probably too young for unsupervised knives); I remember hallucinating music (or possibly just parsing hosptial background noise as music), which honestly, I rarely hallucinate that kind of distant music anyway. Otherwise I remember it being pretty boring and pleasant, esp compared to the rest of that afternoon... I don't have many details though, it was only once and is crowded on either side by the other bits.

(aaahhh and now I just made the connection between certain very unpleasant knife-related intrusive thoughts and this. That should have been obvious but there you go)