I'm starting out by mentioning Coldplay, but feel free to add other themes which seem very close to something older.

Driving home the other night I heard Coldplay: Everglow. I couldn't shake the idea that I knew the theme already.

Is it just me, or can anyone else pick up the hymn "When a knight won his spurs" in this one?

Coldplay: https://www.youtube.com/watch?v=P8jOQUsTU9o
"When a knight won his spurs": https://www.youtube.com/watch?v=MWk6L9T5-es

Full links above to warn they're YouTube
Abbreviated links for clicking:
Coldplay
When a knight

A bit more Googling gives the original as a hymn by Jan Struther (Joyce Anstruther) written to a folk melody (Stowey)

Cheers
Nigel