TIL that the Glen Campbell song, "I'm Not Gonna Miss You", was about his future after being diagnosed with Alzheimer's. It ended up being the last song he recorded.

https://en.wikipedia.org/wiki/I'm_Not_Gonna_Miss_You

https://www.reddit.com/r/todayilearned/comments/153iui6/til_that_the_glen_campbell_song_im_not_gonna_miss/