I unconsciously whistle when doing mindless tasks at work...
One of the tunes I whistle is Swing Low, Sweet Chariot...
A co-worker asked where I learned it (I don’t come across as a gospel aficionado) - told her - 4th Grade Chorus, public schools were different 50+ years ago...
I also learned “Swing Low Sweet Chariot” in my public elementary school. I am not that old either. I think it depends on the school district.