Who are the two primary composers whose works are included in Magnus liber organi?

Which of the following best describes this selection's harmonic idiom?

a) tonal with modulations to harmonic movement to markedly modal sections at important structural moments b) modal c) predominately diatonic and tonal d) highly chromatic

Which of the following was NOT a reason for the end of the cross-national cooperative efforts of the "Film Europe" movement?

A. the introduction of sound films B. the international success of German cinema C. the rise of extreme left-wing and right-wing dictatorships in Europe D. the onset of the Great Depression