"Big Spender" is a song written by Cy Coleman and Dorothy Fields for the musical "Sweet Charity", first performed in 1966. It is sung, in the musical, by the dance hostess girls; it was choreographed by Bob Fosse for the Broadway musical and the film. It is set to the beat of a striptease as the girls taunt the customers.
Big Spender was written in the 20th century.
It's definitely correct because the song or the musical were both first performed in 1966, so the song must have been written in the 20th century. It's difficult for the system because the system seems poor at determining what it means for something to be done in a specific century.