Sting?
The first line of my riddle “I believe in Father Christmas” is a line from a song by Emerson, Lake, And Palmer, which steals from Lt. Kije’s Sleigh Ride.
The second line is from Sting’s “Russians” which steals from Lt. Kije’s “Romance”
So a Great Jeopardy question could be:
These two pop songs steal themes from Prokofiev’s Lt. Kije.
And the answer would be:
Father Christmas and Russians.