Who was American, Gustave Charpentier or Samuel Barber or both? 
Gustave Charpentier: Gustave Charpentier (] ; 25 June 1860 – 18 February 1956) was a French composer, best known for his opera "Louise". Samuel Barber: Samuel Osborne Barber II (March 9, 1910 – January 23, 1981) was an American composer of orchestral, opera, choral, and piano music.
Samuel Osborne Barber