Original: Toscanini was often criticized for neglecting American music ; however , on November 5 , 1938 , he conducted the world premieres of two orchestral works by Samuel Barber , Adagio for Strings and Essay for Orchestra .
Simplified: However , in 1938 , he conducted the world premieres of two orchestral works by Samuel Barber , Adagio for Strings and Essay for Orchestra ( Barber ) | Essay for Orchestra .