You know, Mike Oldfield didn’t write “Tubular Bells” for The Exorcist. Director William Friedkin picked it when the original soundtrack was too scary, and he didn’t yet know about Tangerine Dream. So, like, in an alternate timeline, that tune doesn’t have any association with anything horrifying. It could have ended up being the sound for merry Christmas melodies of the 70s and 80s. You never see that sort of thing in alternate-history novels, though. Alternate history is a fun genre, ranging from stories about “what if the worst people won the major war” all the way to stories about “what if there were lots more moon landings”. But it never wonders about what if prog rock albums were appreciated differently.